<s>
Messenger	B-Protocol
is	O
an	O
American	O
proprietary	B-Application
instant	B-Application
messaging	I-Application
app	O
and	O
platform	O
developed	O
by	O
Meta	O
Platforms	O
.	O
</s>
<s>
Originally	O
developed	O
as	O
Facebook	B-Protocol
Chat	I-Protocol
in	O
2008	O
,	O
the	O
company	O
revamped	O
its	O
messaging	O
service	O
in	O
2010	O
,	O
released	O
standalone	O
iOS	B-Application
and	O
Android	B-Application
apps	O
in	O
2011	O
,	O
and	O
released	O
standalone	O
Facebook	B-Application
Portal	O
hardware	O
for	O
Messenger	B-Protocol
calling	O
in	O
2018	O
.	O
</s>
<s>
In	O
April	O
2015	O
,	O
Facebook	B-Application
launched	O
a	O
dedicated	O
website	B-Application
interface	I-Application
,	O
Messenger.com,	O
and	O
separated	O
the	O
messaging	O
functionality	O
from	O
the	O
main	O
Facebook	B-Application
app	O
,	O
allowing	O
users	O
to	O
use	O
the	O
web	B-Application
interface	O
or	O
download	O
one	O
of	O
the	O
standalone	O
apps	O
.	O
</s>
<s>
In	O
April	O
2020	O
,	O
Facebook	B-Application
released	O
a	O
Messenger	B-Protocol
desktop	O
app	O
for	O
Windows	O
and	O
macOS	B-Application
.	O
</s>
<s>
Messenger	B-Protocol
is	O
used	O
to	O
send	O
messages	O
and	O
exchange	O
photos	O
,	O
videos	O
,	O
stickers	O
,	O
audio	O
,	O
and	O
files	O
,	O
and	O
also	O
react	O
to	O
other	O
users	O
 '	O
messages	O
and	O
interact	O
with	O
bots	B-Application
.	O
</s>
<s>
The	O
service	O
also	O
supports	O
voice	B-Application
and	O
video	B-Application
calling	I-Application
.	O
</s>
<s>
Following	O
tests	O
of	O
a	O
new	O
instant	B-Application
messaging	I-Application
platform	O
on	O
Facebook	B-Application
in	O
March	O
2008	O
,	O
the	O
feature	O
,	O
then-titled	O
"	O
Facebook	B-Protocol
Chat	I-Protocol
"	O
,	O
was	O
gradually	O
released	O
to	O
users	O
in	O
April	O
2008	O
.	O
</s>
<s>
Facebook	B-Application
revamped	O
its	O
messaging	O
platform	O
in	O
November	O
2010	O
,	O
and	O
subsequently	O
acquired	O
group	O
messaging	O
service	O
Beluga	O
in	O
March	O
2011	O
,	O
which	O
the	O
company	O
used	O
to	O
launch	O
its	O
standalone	O
iOS	B-Application
and	O
Android	B-Application
mobile	I-Application
apps	O
on	O
August	O
9	O
,	O
2011	O
.	O
</s>
<s>
Facebook	B-Application
later	O
launched	O
a	O
BlackBerry	B-Application
version	O
in	O
October	O
2011	O
.	O
</s>
<s>
An	O
app	O
for	O
Windows	B-Protocol
Phone	I-Protocol
,	O
though	O
lacking	O
features	O
including	O
voice	B-Application
messaging	O
and	O
chat	O
heads	O
,	O
was	O
released	O
in	O
March	O
2014	O
.	O
</s>
<s>
In	O
April	O
2014	O
,	O
Facebook	B-Application
announced	O
that	O
the	O
messaging	O
feature	O
would	O
be	O
removed	O
from	O
the	O
main	O
Facebook	B-Application
app	O
and	O
users	O
will	O
be	O
required	O
to	O
download	O
the	O
separate	O
Messenger	B-Protocol
app	O
.	O
</s>
<s>
An	O
iPad-optimized	O
version	O
of	O
the	O
iOS	B-Application
app	O
was	O
released	O
in	O
July	O
2014	O
.	O
</s>
<s>
In	O
April	O
2015	O
,	O
Facebook	B-Application
launched	O
a	O
website	B-Application
interface	I-Application
for	O
Messenger	B-Protocol
.	O
</s>
<s>
A	O
Tizen	B-Application
app	O
was	O
released	O
on	O
July	O
13	O
,	O
2015	O
.	O
</s>
<s>
Facebook	B-Application
launched	O
Messenger	B-Protocol
for	O
Windows	B-Operating_System
10	I-Operating_System
in	O
April	O
2016	O
.	O
</s>
<s>
In	O
October	O
2016	O
,	O
Facebook	B-Application
released	O
Messenger	B-Protocol
Lite	I-Protocol
,	O
a	O
stripped-down	O
version	O
of	O
Messenger	B-Protocol
with	O
a	O
reduced	O
feature	O
set	O
.	O
</s>
<s>
The	O
app	O
is	O
aimed	O
primarily	O
at	O
old	O
Android	B-Application
phones	I-Application
and	O
regions	O
where	O
high-speed	O
Internet	O
is	O
not	O
widely	O
available	O
.	O
</s>
<s>
In	O
April	O
2017	O
,	O
Messenger	B-Protocol
Lite	I-Protocol
was	O
expanded	O
to	O
132	O
more	O
countries	O
.	O
</s>
<s>
In	O
May	O
2017	O
,	O
Facebook	B-Application
revamped	O
the	O
design	O
for	O
Messenger	B-Protocol
on	O
Android	B-Application
and	O
iOS	B-Application
,	O
bringing	O
a	O
new	O
home	O
screen	O
with	O
tabs	O
and	O
categorization	O
of	O
content	O
and	O
interactive	O
media	O
,	O
red	O
dots	O
indicating	O
new	O
activity	O
,	O
and	O
relocated	O
sections	O
.	O
</s>
<s>
Facebook	B-Application
announced	O
a	O
Messenger	B-Protocol
program	O
for	O
Windows	B-Device
7	I-Device
in	O
a	O
limited	O
beta	O
test	O
in	O
November	O
2011	O
.	O
</s>
<s>
The	O
following	O
month	O
,	O
Israeli	O
blog	O
TechIT	O
leaked	O
a	O
download	O
link	O
for	O
the	O
program	O
,	O
with	O
Facebook	B-Application
subsequently	O
confirming	O
and	O
officially	O
releasing	O
the	O
program	O
.	O
</s>
<s>
A	O
Firefox	B-Application
web	I-Application
browser	I-Application
add-on	B-Operating_System
was	O
released	O
in	O
December	O
2012	O
,	O
but	O
was	O
also	O
discontinued	O
in	O
March	O
2014	O
.	O
</s>
<s>
In	O
December	O
2017	O
,	O
Facebook	B-Application
announced	O
Messenger	B-Protocol
Kids	I-Protocol
,	O
a	O
new	O
app	O
aimed	O
for	O
persons	O
under	O
13	O
years	O
of	O
age	O
.	O
</s>
<s>
In	O
2019	O
,	O
Messenger	B-Protocol
announced	O
to	O
be	O
the	O
2nd	O
most	O
downloaded	O
mobile	O
app	O
of	O
the	O
decade	O
,	O
from	O
2011	O
to	O
2019	O
.	O
</s>
<s>
In	O
December	O
2019	O
,	O
Messenger	B-Protocol
dropped	O
support	O
for	O
users	O
to	O
sign	O
in	O
using	O
only	O
a	O
mobile	O
number	O
,	O
meaning	O
that	O
users	O
must	O
sign	O
in	O
to	O
a	O
Facebook	B-Application
account	O
in	O
order	O
to	O
use	O
the	O
service	O
.	O
</s>
<s>
In	O
March	O
2020	O
,	O
Facebook	B-Application
started	O
to	O
ship	O
its	O
dedicated	O
Messenger	B-Protocol
for	O
macOS	B-Application
app	O
through	O
the	O
Mac	O
App	O
Store	O
.	O
</s>
<s>
In	O
April	O
2020	O
,	O
Facebook	B-Application
began	O
rolling	O
out	O
a	O
new	O
feature	O
called	O
Messenger	B-Protocol
Rooms	O
,	O
a	O
video	B-Application
chat	I-Application
feature	O
that	O
allows	O
users	O
to	O
chat	O
with	O
up	O
to	O
50	O
people	O
at	O
a	O
time	O
.	O
</s>
<s>
The	O
feature	O
rivals	O
Zoom	B-Application
,	O
an	O
application	O
that	O
gained	O
a	O
lot	O
of	O
popularity	O
during	O
the	O
COVID-19	O
pandemic	O
.	O
</s>
<s>
Privacy	O
concerns	O
arose	O
since	O
the	O
feature	O
uses	O
the	O
same	O
data	O
collection	O
policies	O
as	O
mainstream	O
Facebook	B-Application
.	I-Application
</s>
<s>
In	O
July	O
2020	O
,	O
Facebook	B-Application
added	O
a	O
new	O
feature	O
in	O
Messenger	B-Protocol
that	O
lets	O
iOS	B-Application
users	O
to	O
use	O
Face	O
ID	O
or	O
Touch	O
ID	O
to	O
lock	O
their	O
chats	O
.	O
</s>
<s>
The	O
feature	O
is	O
called	O
App	O
Lock	O
and	O
is	O
a	O
part	O
of	O
several	O
changes	O
in	O
Messenger	B-Protocol
regarding	O
privacy	O
and	O
security	O
.	O
</s>
<s>
On	O
October	O
13	O
,	O
2020	O
,	O
Facebook	B-Application
's	O
Messenger	B-Protocol
application	O
introduced	O
cross-app	O
messaging	O
with	O
Instagram	O
,	O
which	O
was	O
launched	O
in	O
September	O
2021	O
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
integrated	O
messaging	O
,	O
the	O
application	O
announced	O
the	O
introduction	O
of	O
a	O
new	O
logo	O
,	O
which	O
will	O
be	O
an	O
amalgamation	O
of	O
the	O
Messenger	B-Protocol
and	O
Instagram	O
logo	O
.	O
</s>
<s>
The	O
following	O
is	O
a	O
table	O
of	O
features	O
available	O
in	O
Messenger	B-Protocol
,	O
as	O
well	O
as	O
their	O
geographical	O
coverage	O
and	O
what	O
devices	O
they	O
are	O
available	O
on	O
.	O
</s>
<s>
Feature	O
Added	O
Description	O
Platforms	O
Availability	O
Sign	O
up	O
without	O
a	O
Facebook	B-Application
account	O
December	O
2012	O
Android	B-Application
users	O
can	O
sign	O
up	O
to	O
the	O
app	O
without	O
a	O
Facebook	B-Application
account	O
,	O
requiring	O
only	O
a	O
name	O
and	O
phone	O
number	O
.	O
</s>
<s>
Mobile	O
Global	O
Money	O
transfer	O
(	O
Messenger	B-Protocol
Pay	O
)	O
March	O
2015	O
A	O
feature	O
for	O
U.S.	O
users	O
to	O
send	O
money	O
to	O
friends	O
.	O
</s>
<s>
Mobile	O
U.S.	O
Calls	O
January	O
2013	O
In	O
January	O
2013	O
,	O
Facebook	B-Application
added	O
voice	B-Application
calling	I-Application
to	O
Messenger	B-Protocol
users	O
in	O
Canada	O
,	O
expanding	O
the	O
feature	O
to	O
users	O
in	O
the	O
United	O
States	O
a	O
few	O
days	O
later	O
.	O
</s>
<s>
In	O
April	O
2015	O
,	O
Facebook	B-Application
introduced	O
video	B-Application
calling	I-Application
in	O
select	O
countries	O
.	O
</s>
<s>
In	O
April	O
2016	O
,	O
group	O
voice	B-Application
calling	I-Application
was	O
introduced	O
,	O
with	O
a	O
maximum	O
number	O
of	O
50	O
call	O
participants	O
.	O
</s>
<s>
The	O
following	O
December	O
,	O
Facebook	B-Application
enabled	O
group	O
video	B-Application
calling	I-Application
for	O
up	O
to	O
50	O
people	O
.	O
</s>
<s>
In	O
June	O
2017	O
,	O
Facebook	B-Application
updated	O
video	B-Application
chats	I-Application
to	O
give	O
users	O
the	O
ability	O
to	O
add	O
animated	O
versions	O
of	O
Facebook	B-Application
's	O
reactions	O
on	O
top	O
of	O
their	O
face	O
,	O
such	O
as	O
tears	O
for	O
a	O
crying	O
face	O
and	O
an	O
exploding	O
halo	O
of	O
hearts	O
around	O
the	O
head	O
when	O
sending	O
heart	O
emoji	B-Application
.	O
</s>
<s>
Mobile	O
Global	O
Business	O
interaction	O
At	O
the	B-Application
Facebook	I-Application
F8	O
conference	O
on	O
March	O
25	O
,	O
2015	O
,	O
Facebook	B-Application
announced	O
that	O
Messenger	B-Protocol
would	O
start	O
letting	O
users	O
interact	O
with	O
businesses	O
,	O
including	O
track	O
purchases	O
and	O
receive	O
notifications	O
,	O
and	O
have	O
personal	O
conversations	O
with	O
company	O
customer	O
service	O
representatives	O
.	O
</s>
<s>
Third-party	O
app	O
integration	O
Users	O
are	O
able	O
to	O
open	O
compatible	O
third-party	O
apps	O
inside	O
Messenger	B-Protocol
,	O
such	O
as	O
a	O
movie	O
ticketing	O
service	O
or	O
GIF	O
generators	O
,	O
and	O
then	O
share	O
those	O
details	O
with	O
the	O
other	O
chat	O
participants	O
.	O
</s>
<s>
Mobile	O
Global	O
Transportation	O
requests	O
December	O
2015	O
Messenger	B-Protocol
integrated	O
with	O
Uber	B-Application
to	O
let	O
U.S.	O
users	O
request	O
a	O
car	O
directly	O
from	O
the	O
app	O
.	O
</s>
<s>
Support	O
for	O
Lyft	B-Application
was	O
added	O
in	O
March	O
2016	O
.	O
</s>
<s>
Support	O
for	O
UberPOOL	B-Application
was	O
introduced	O
in	O
July	O
2016	O
.	O
</s>
<s>
Mobile	O
U.S.	O
SMS	B-Device
support	O
2012	O
Facebook	B-Application
implemented	O
support	O
for	O
SMS	B-Device
texting	O
within	O
the	O
Messenger	B-Protocol
Android	B-Application
app	O
.	O
</s>
<s>
However	O
,	O
the	O
feature	O
was	O
dropped	O
in	O
2013	O
due	O
to	O
"	O
extensive	O
reworking	O
"	O
of	O
the	O
app	O
,	O
with	O
a	O
Facebook	B-Application
product	O
manager	O
stating	O
that	O
the	O
SMS	B-Device
feature	O
"	O
just	O
did	O
n't	O
take	O
off	O
"	O
.	O
</s>
<s>
SMS	B-Device
was	O
once	O
again	O
introduced	O
in	O
testing	O
in	O
February	O
2016	O
,	O
before	O
the	O
official	O
global	O
rollout	O
started	O
in	O
June	O
.	O
</s>
<s>
Android	B-Application
Global	O
Multiple	O
accounts	O
February	O
2016	O
Facebook	B-Application
added	O
support	O
for	O
multiple	O
accounts	O
in	O
the	O
apps	O
.	O
</s>
<s>
In	O
April	O
2016	O
,	O
Facebook	B-Application
announced	O
a	O
bot	B-General_Concept
platform	O
for	O
Messenger	B-Protocol
,	O
including	O
an	O
API	B-General_Concept
to	O
build	O
chat	O
bots	B-Application
to	O
interact	O
with	O
users	O
.	O
</s>
<s>
News	O
publisher	O
bots	B-Application
"	O
message	O
subscribers	O
directly	O
with	O
news	O
and	O
other	O
information	O
"	O
,	O
while	O
ride-sharing	O
apps	O
can	O
offer	O
a	O
transportation	O
option	O
,	O
hotel	O
chains	O
can	O
answer	O
questions	O
about	O
accommodations	O
,	O
and	O
air	O
travel	O
companies	O
can	O
allow	O
for	O
check-ins	O
,	O
flight	O
updates	O
and	O
travel	O
changes	O
.	O
</s>
<s>
At	O
the	O
2017	O
Facebook	B-Application
F8	O
conference	O
,	O
Facebook	B-Application
announced	O
a	O
range	O
of	O
enhancements	O
for	O
bots	B-Application
:	O
</s>
<s>
Bots	B-Application
in	O
group	O
chats	O
:	O
Bots	B-Application
can	O
participate	O
in	O
group	O
chats	O
–	O
not	O
by	O
conversing	O
with	O
the	O
chat	O
participants	O
—	O
but	O
by	O
injecting	O
notifications	O
such	O
as	O
news	O
updates	O
,	O
receipts	O
,	O
sports	O
progress	O
,	O
and	O
more	O
.	O
</s>
<s>
In	O
addition	O
,	O
Facebook	B-Application
announced	O
a	O
"	O
Discovery	O
"	O
tab	O
,	O
featuring	O
recently	O
used	O
bots	B-Application
,	O
bot	B-General_Concept
categories	O
,	O
trending	O
experiences	O
and	O
search	O
functionality	O
.	O
</s>
<s>
QR	O
scan	O
:	O
Users	O
can	O
scan	O
special	O
,	O
branded	O
QR	O
codes	O
through	O
Messenger	B-Protocol
's	O
camera	O
functionality	O
,	O
that	O
take	O
the	O
user	O
directly	O
to	O
a	O
specific	O
bot	B-General_Concept
.	O
</s>
<s>
All	O
Global	O
"	O
M	B-Protocol
"	O
assistant	O
April	O
2017	O
(	O
terminated	O
)	O
In	O
August	O
2015	O
,	O
Facebook	B-Application
announced	O
M	B-Protocol
,	O
an	O
artificial	B-Application
intelligence	I-Application
virtual	B-Protocol
assistant	I-Protocol
for	O
use	O
in	O
Messenger	B-Protocol
that	O
is	O
capable	O
of	O
automatically	O
completing	O
tasks	O
for	O
users	O
,	O
such	O
as	O
purchase	O
items	O
,	O
arrange	O
gift	O
deliveries	O
,	O
book	O
restaurants	O
,	O
and	O
arrange	O
travels	O
.	O
</s>
<s>
In	O
April	O
2017	O
,	O
Facebook	B-Application
enabled	O
M	B-Protocol
for	O
users	O
in	O
the	O
U.S.	O
M	B-Protocol
scans	O
chats	O
for	O
keywords	O
and	O
then	O
suggests	O
relevant	O
actions	O
.	O
</s>
<s>
For	O
example	O
,	O
writing	O
"	O
You	O
owe	O
me	O
$20	O
"	O
will	O
make	O
M	B-Protocol
offer	O
its	O
payments	O
system	O
.	O
</s>
<s>
The	O
rollout	O
of	O
M	B-Protocol
suggestions	O
was	O
made	O
official	O
at	O
Facebook	B-Application
's	O
F8	O
conference	O
on	O
April	O
18	O
,	O
2017	O
.	O
</s>
<s>
In	O
January	O
2018	O
it	O
was	O
announced	O
that	O
M	B-Protocol
would	O
be	O
discontinued	O
at	O
some	O
future	O
date	O
.	O
</s>
<s>
All	O
U.S.	O
"	O
Home	O
"	O
messages	O
panel	O
June	O
2016	O
Facebook	B-Application
announced	O
a	O
"	O
Home	O
"	O
button	O
as	O
a	O
central	O
location	O
for	O
sending	O
and	O
receiving	O
messages	O
.	O
</s>
<s>
Mobile	O
Global	O
Secret	O
Conversations	O
October	O
2016	O
Messenger	B-Protocol
users	O
can	O
send	O
each	O
other	O
end-to-end	O
encrypted	O
messages	O
through	O
an	O
optional	O
mode	O
called	O
"	O
Secret	O
Conversations	O
"	O
,	O
which	O
uses	O
the	O
Signal	B-Protocol
Protocol	I-Protocol
.	O
</s>
<s>
This	O
feature	O
is	O
only	O
available	O
in	O
mobile	O
apps	O
,	O
not	O
in	O
the	O
web	B-Application
version	O
.	O
</s>
<s>
Mobile	O
Global	O
Instant	O
Games	O
November	O
2016	O
Allows	O
users	O
to	O
quickly	O
play	O
games	O
including	O
Pac-Man	B-Application
,	O
Space	B-Application
Invaders	I-Application
,	O
EverWing	B-Application
and	O
Words	B-Application
with	I-Application
Friends	I-Application
Frenzy	O
inside	O
Messenger	B-Protocol
.	O
</s>
<s>
Games	O
are	O
asynchronous	O
through	O
high	O
scores	O
rather	O
than	O
directly	O
at	O
the	O
same	O
time	O
,	O
and	O
are	O
built	O
on	O
HTML5	B-Application
rather	O
than	O
apps	O
.	O
</s>
<s>
In	O
May	O
2017	O
,	O
Facebook	B-Application
announced	O
the	O
global	O
rollout	O
of	O
Instant	O
Games	O
.	O
</s>
<s>
Mobile	O
Global	O
Messenger	B-Protocol
Day	O
March	O
2017	O
Following	O
an	O
initial	O
test	O
in	O
Poland	O
in	O
September	O
2016	O
,	O
Facebook	B-Application
launched	O
"	O
Messenger	B-Protocol
Day	O
"	O
in	O
March	O
2017	O
.	O
</s>
<s>
Messenger	B-Protocol
Day	O
,	O
similar	O
to	O
Snapchat	O
's	O
Stories	O
feature	O
,	O
gives	O
the	O
user	O
the	O
ability	O
to	O
share	O
photos	O
and	O
videos	O
with	O
friends	O
that	O
automatically	O
disappear	O
after	O
24	O
hours	O
.	O
</s>
<s>
Mobile	O
Global	O
Reactions	O
and	O
Mentions	O
March	O
2017	O
Reactions	O
let	O
the	O
user	O
tap	O
and	O
hold	O
on	O
a	O
message	O
to	O
add	O
a	O
reaction	O
through	O
an	O
emoji	B-Application
,	O
while	O
Mentions	O
let	O
the	O
user	O
type	O
@	O
in	O
a	O
group	O
chat	O
to	O
give	O
a	O
particular	O
user	O
a	O
direct	O
notification	O
.	O
</s>
<s>
All	O
Global	O
Augmented	B-General_Concept
reality	I-General_Concept
effects	I-General_Concept
December	O
2017	O
"	O
World	O
Effects	O
"	O
lets	O
users	O
add	O
3D	B-General_Concept
augmented	B-General_Concept
reality	I-General_Concept
effects	I-General_Concept
into	O
their	O
photos	O
and	O
videos	O
.	O
</s>
<s>
Mobile	O
GlobalAI	O
Chatbots	B-Application
in	O
messengersJanuary	O
2018Facebook	O
started	O
allowing	O
messenger	B-Protocol
AI	B-Application
bots	B-Application
after	O
2	O
steps	O
of	O
verification	O
.	O
</s>
<s>
It	O
is	O
a	O
video	B-Application
conferencing	I-Application
feature	O
of	O
Messenger	B-Protocol
.	O
</s>
<s>
Messenger	B-Protocol
Rooms	O
does	O
not	O
require	O
a	O
Facebook	B-Application
account	O
.	O
</s>
<s>
Messenger	B-Protocol
Rooms	O
competes	O
with	O
other	O
services	O
such	O
as	O
Zoom	B-Application
.	O
</s>
<s>
Back	O
in	O
2014	O
,	O
Facebook	B-Application
introduced	O
an	O
unrelated	O
,	O
stand-alone	O
application	O
named	O
Rooms	O
,	O
letting	O
users	O
create	O
places	O
for	O
users	O
with	O
similar	O
interests	O
,	O
with	O
users	O
being	O
anonymous	O
to	O
others	O
.	O
</s>
<s>
In	O
April	O
2020	O
,	O
during	O
the	O
COVID-19	O
pandemic	O
,	O
Facebook	B-Application
revealed	O
video	B-Application
conferencing	I-Application
features	O
for	O
Messenger	B-Protocol
called	O
Messenger	B-Protocol
Rooms	O
.	O
</s>
<s>
This	O
was	O
seen	O
as	O
a	O
response	O
to	O
the	O
popularity	O
of	O
other	O
video	B-Application
conferencing	I-Application
platforms	O
such	O
as	O
Zoom	B-Application
and	O
Skype	B-Application
in	O
the	O
midst	O
of	O
the	O
COVID-19	O
pandemic	O
.	O
</s>
<s>
Messenger	B-Protocol
Rooms	O
allows	O
users	O
to	O
add	O
up	O
to	O
50	O
people	O
per	O
room	O
,	O
without	O
restrictions	O
on	O
time	O
.	O
</s>
<s>
It	O
does	O
not	O
require	O
a	O
Facebook	B-Application
account	O
or	O
a	O
separate	O
app	O
from	O
Messenger	B-Protocol
.	O
</s>
<s>
Users	O
can	O
add	O
360°	O
virtual	O
backgrounds	O
,	O
mood	O
lighting	O
,	O
and	O
other	O
AR	B-General_Concept
effects	O
as	O
well	O
as	O
share	O
screens	O
.	O
</s>
<s>
Some	O
have	O
voiced	O
concerns	O
in	O
regards	O
to	O
Messenger	B-Protocol
Room	O
's	O
privacy	O
and	O
how	O
its	O
parent	O
,	O
Facebook	B-Application
,	O
handles	O
data	O
.	O
</s>
<s>
Messenger	B-Protocol
Rooms	O
,	O
unlike	O
some	O
of	O
its	O
competitors	O
,	O
does	O
not	O
use	O
end-to-end	O
encryption	O
.	O
</s>
<s>
In	O
addition	O
,	O
there	O
have	O
been	O
concerns	O
over	O
how	O
Messenger	B-Protocol
Rooms	O
collects	O
user	O
data	O
.	O
</s>
<s>
In	O
January	O
2017	O
,	O
Facebook	B-Application
announced	O
that	O
it	O
was	O
testing	O
showing	O
advertisements	O
in	O
Messenger	B-Protocol
's	O
home	O
feed	O
.	O
</s>
<s>
Stan	O
Chudnovsky	O
,	O
head	O
of	O
Messenger	B-Protocol
,	O
told	O
VentureBeat	O
that	O
"	O
We	O
'll	O
start	O
slow	O
...	O
</s>
<s>
Facebook	B-Application
told	O
TechCrunch	O
that	O
the	O
advertisements	O
 '	O
placement	O
in	O
the	O
inbox	O
depends	O
on	O
factors	O
such	O
as	O
thread	O
count	O
,	O
phone	O
screen	O
size	O
,	O
and	O
pixel	O
density	O
.	O
</s>
<s>
Coldewey	O
finished	O
by	O
writing	O
"	O
Advertising	O
is	O
how	O
things	O
get	O
paid	O
for	O
on	O
the	O
internet	O
,	O
including	O
TechCrunch	O
,	O
so	O
I	O
'm	O
not	O
an	O
advocate	O
of	O
eliminating	O
it	O
or	O
blocking	O
it	O
altogether	O
.	O
</s>
<s>
But	O
bad	O
advertising	O
experiences	O
can	O
spoil	O
a	O
perfectly	O
good	O
app	O
like	O
(	O
for	O
the	O
purposes	O
of	O
argument	O
)	O
Messenger	B-Protocol
.	O
</s>
<s>
In	O
November	O
2014	O
,	O
the	O
Electronic	O
Frontier	O
Foundation	O
(	O
EFF	O
)	O
listed	O
Messenger	B-Protocol
(	O
Facebook	B-Protocol
chat	I-Protocol
)	O
on	O
its	O
Secure	O
Messaging	O
Scorecard	O
.	O
</s>
<s>
As	O
stated	O
by	O
Facebook	B-Application
in	O
its	O
Help	O
Center	O
,	O
there	O
is	O
no	O
way	O
to	O
log	O
out	O
of	O
the	O
Messenger	B-Protocol
application	O
.	O
</s>
<s>
Media	O
outlets	O
have	O
reported	O
on	O
a	O
workaround	O
,	O
by	O
pressing	O
a	O
"	O
Clear	O
data	O
"	O
option	O
in	O
the	O
application	O
's	O
menu	O
in	O
Settings	O
on	O
Android	B-Application
devices	O
,	O
which	O
returns	O
the	O
user	O
to	O
the	O
log-in	O
screen	O
.	O
</s>
<s>
After	O
being	O
separated	O
from	O
the	O
main	O
Facebook	B-Application
app	O
,	O
Messenger	B-Protocol
had	O
600million	O
users	O
in	O
April	O
2015	O
.	O
</s>
<s>
In	O
early	O
2018	O
,	O
the	O
US	O
Department	O
of	O
Justice	O
went	O
to	O
court	O
to	O
attempt	O
to	O
force	O
Facebook	B-Application
to	O
modify	O
its	O
Messenger	B-Protocol
app	O
to	O
enable	O
surveillance	O
by	O
third	O
parties	O
so	O
that	O
agents	O
could	O
listen	O
in	O
on	O
encrypted	O
voice	B-Application
conversations	O
over	O
Messenger	B-Protocol
.	O
</s>
