<s>
Scroll	B-Operating_System
is	O
a	O
web	O
service	O
developed	O
by	O
Scroll	B-Operating_System
Labs	O
Inc	O
.	O
that	O
offers	O
ad-free	O
access	O
to	O
websites	O
in	O
exchange	O
for	O
a	O
subscription	O
fee	O
.	O
</s>
<s>
Scroll	B-Operating_System
is	O
not	O
an	O
ad	O
blocker	O
,	O
but	O
rather	O
partners	O
directly	O
with	O
internet	O
publishers	O
who	O
voluntarily	O
take	O
down	O
ads	O
on	O
their	O
site	O
for	O
Scroll	B-Operating_System
users	O
in	O
exchange	O
for	O
a	O
portion	O
of	O
the	O
subscription	O
fee	O
.	O
</s>
<s>
In	O
May	O
2021	O
,	O
Scroll	B-Operating_System
was	O
acquired	O
by	O
Twitter	B-Application
.	O
</s>
<s>
It	O
is	O
now	O
shutting	O
down	O
and	O
integrated	O
into	O
Twitter	B-Application
Blue	O
.	O
</s>
<s>
Scroll	B-Operating_System
enables	O
users	O
to	O
browse	O
websites	O
partnered	O
with	O
Scroll	B-Operating_System
without	O
the	O
display	O
of	O
online	O
advertisements	O
in	O
exchange	O
for	O
paying	O
a	O
contribution	O
fee	O
.	O
</s>
<s>
Scroll	B-Operating_System
does	O
not	O
work	O
as	O
an	O
ad	O
blocker	O
,	O
which	O
disables	O
advertisements	O
without	O
compensation	O
to	O
the	O
publisher	O
;	O
instead	O
,	O
it	O
sets	O
a	O
browser	B-Application
cookie	I-Application
indicating	O
that	O
the	O
user	O
is	O
a	O
Scroll	B-Operating_System
subscriber	O
,	O
and	O
Scroll	B-Operating_System
software	O
incorporated	O
into	O
the	O
website	O
detects	O
the	O
cookie	B-Application
and	O
serves	O
an	O
ad-free	O
version	O
of	O
the	O
site	O
.	O
</s>
<s>
As	O
of	O
January	O
2020	O
,	O
Scroll	B-Operating_System
keeps	O
30%	O
of	O
the	O
subscription	O
fee	O
and	O
the	O
rest	O
is	O
distributed	O
among	O
publisher	O
sites	O
.	O
</s>
<s>
Scroll	B-Operating_System
does	O
not	O
give	O
subscribers	O
access	O
to	O
partner	O
sites	O
that	O
have	O
a	O
paywall	O
,	O
it	O
only	O
removes	O
ads	O
from	O
the	O
site	O
if	O
the	O
user	O
also	O
pays	O
the	O
publication	O
's	O
subscription	O
fee	O
.	O
</s>
<s>
Scroll	B-Operating_System
was	O
founded	O
in	O
2016	O
by	O
former	O
Chartbeat	B-Protocol
Chief	O
Executive	O
Tony	O
Haile	O
.	O
</s>
<s>
Scroll	B-Operating_System
raised	O
US$3	O
million	O
in	O
its	O
first	O
round	O
of	O
funding	O
in	O
2016	O
,	O
including	O
investments	O
from	O
The	O
New	O
York	O
Times	O
,	O
Uncork	O
Capital	O
,	O
and	O
Axel	O
Springer	O
SE	O
.	O
</s>
<s>
By	O
October	O
2018	O
,	O
Scroll	B-Operating_System
had	O
raised	O
US$10	O
million	O
in	O
funding	O
.	O
</s>
<s>
In	O
2018	O
,	O
Scroll	B-Operating_System
signed	O
its	O
first	O
partner	O
websites	O
,	O
which	O
included	O
The	O
Atlantic	O
,	O
Fusion	O
Media	O
Group	O
,	O
Business	O
Insider	O
,	O
Slate	O
,	O
MSNBC	O
,	O
The	O
Philadelphia	O
Inquirer	O
,	O
and	O
Talking	O
Points	O
Memo	O
.	O
</s>
<s>
In	O
February	O
2019	O
,	O
Scroll	B-Operating_System
acquired	O
social	O
media	O
curation	O
app	O
Nuzzel	O
.	O
</s>
<s>
The	O
same	O
month	O
,	O
Mozilla	B-Operating_System
and	O
Scroll	B-Operating_System
announced	O
partnership	O
to	O
run	O
a	O
"	O
test	O
pilot	O
"	O
together	O
,	O
but	O
did	O
not	O
go	O
into	O
details	O
.	O
</s>
<s>
Scroll	B-Operating_System
entered	O
beta	O
testing	O
in	O
2019	O
,	O
and	O
launched	O
to	O
the	O
general	O
public	O
on	O
January	O
28	O
,	O
2020	O
.	O
</s>
<s>
In	O
March	O
2020	O
,	O
Mozilla	B-Operating_System
began	O
offering	O
Scroll	B-Operating_System
as	O
part	O
of	O
its	O
"	O
Firefox	B-Application
Better	O
Web	O
"	O
service	O
bundle	O
.	O
</s>
<s>
In	O
May	O
2021	O
,	O
Scroll	B-Operating_System
was	O
acquired	O
by	O
Twitter	B-Application
,	O
with	O
the	O
future	O
of	O
Scroll	B-Operating_System
cited	O
as	O
being	O
uncertain	O
.	O
</s>
<s>
An	O
email	O
to	O
customers	O
announcing	O
the	O
change	O
said	O
,	O
"	O
Later	O
this	O
year	O
,	O
Scroll	B-Operating_System
will	O
become	O
part	O
of	O
a	O
wider	O
Twitter	B-Application
subscription	O
that	O
will	O
expand	O
on	O
and	O
adapt	O
our	O
services	O
and	O
functionality	O
"	O
.	O
</s>
