<s>
OStatus	B-Application
is	O
an	O
open	O
standard	O
for	O
federated	O
microblogging	B-Application
,	O
allowing	O
users	O
on	O
one	O
website	O
to	O
send	O
and	O
receive	O
status	B-Application
updates	I-Application
with	O
users	O
on	O
another	O
website	O
.	O
</s>
<s>
The	O
standard	O
describes	O
how	O
a	O
suite	O
of	O
open	O
protocols	O
,	O
including	O
Atom	B-Application
,	O
Activity	B-Application
Streams	I-Application
,	O
WebSub	B-Application
,	O
Salmon	B-Protocol
,	O
and	O
WebFinger	B-Protocol
,	O
can	O
be	O
used	O
together	O
,	O
which	O
enables	O
different	O
microblogging	B-Application
server	O
implementations	O
to	O
route	O
status	B-Application
updates	I-Application
between	O
their	O
users	O
back-and-forth	O
,	O
in	O
near	O
real-time	O
.	O
</s>
<s>
OStatus	B-Application
federation	O
was	O
first	O
possible	O
between	O
StatusNet	B-Protocol
installations	O
,	O
such	O
as	O
Status.net	B-Protocol
and	O
Identi.ca,	O
although	O
Identi.ca	O
later	O
switched	O
to	O
pump.io	B-Operating_System
.	O
</s>
<s>
As	O
of	O
June	O
2013	O
,	O
a	O
number	O
of	O
other	O
microblogging	B-Application
applications	O
and	O
content	B-Protocol
management	I-Protocol
systems	I-Protocol
had	O
announced	O
that	O
they	O
intended	O
to	O
implement	O
the	O
standard	O
.	O
</s>
<s>
That	O
same	O
month	O
,	O
it	O
was	O
announced	O
StatusNet	B-Protocol
would	O
be	O
merged	O
into	O
the	O
GNU	B-Protocol
social	I-Protocol
project	O
,	O
along	O
with	O
Free	O
Social	O
.	O
</s>
<s>
Following	O
the	O
first	O
official	O
release	O
of	O
GNU	B-Protocol
Social	I-Protocol
,	O
a	O
number	O
of	O
microblogging	B-Application
sites	O
running	O
StatusNet	B-Protocol
and	O
Free	O
Social	O
began	O
to	O
transition	O
to	O
it	O
.	O
</s>
<s>
But	O
frustrations	O
with	O
the	O
technology	O
underpinning	O
GNU	B-Protocol
Social	I-Protocol
led	O
to	O
a	O
number	O
of	O
new	O
server	O
packages	O
that	O
aimed	O
to	O
be	O
compatible	O
with	O
GNU	B-Protocol
Social	I-Protocol
using	O
OStatus	B-Application
,	O
including	O
Mastodon	B-Application
(	O
until	O
October	O
2019	O
)	O
,	O
Pleroma	O
,	O
and	O
postActiv	O
.	O
</s>
<s>
In	O
January	O
2012	O
,	O
a	O
W3C	O
Community	O
Group	O
was	O
opened	O
to	O
maintain	O
and	O
further	O
develop	O
the	O
OStatus	B-Application
standard	O
.	O
</s>
<s>
This	O
working	O
group	O
focused	O
on	O
creating	O
a	O
newer	O
standard	O
,	O
called	O
ActivityPub	B-Operating_System
,	O
based	O
on	O
the	O
protocols	O
used	O
in	O
pump.io,	O
which	O
has	O
been	O
standardized	O
as	O
a	O
successor	O
to	O
OStatus	B-Application
.	O
</s>
<s>
Projects	O
in	O
active	O
development	O
using	O
OStatus	B-Application
for	O
federation	O
.	O
</s>
