<s>
Pump.io	B-Operating_System
(	O
pronounced	O
"	O
pump	O
eye-oh	O
"	O
)	O
is	O
a	O
general-purpose	O
activity	B-Application
streams	I-Application
engine	O
that	O
can	O
be	O
used	O
as	O
a	O
federated	O
social	O
networking	O
protocol	O
which	O
"	O
does	O
most	O
of	O
what	O
people	O
really	O
want	O
from	O
a	O
social	O
network	O
"	O
.	O
</s>
<s>
Started	O
by	O
Evan	O
Prodromou	O
,	O
it	O
is	O
a	O
follow-up	O
to	O
StatusNet	B-Protocol
;	O
Identi.ca,	O
which	O
was	O
the	O
largest	O
StatusNet	B-Protocol
service	O
,	O
switched	O
to	O
pump.io	B-Operating_System
in	O
June	O
2013	O
.	O
</s>
<s>
Designed	O
to	O
be	O
much	O
more	O
lightweight	O
and	O
efficient	O
than	O
its	O
StatusNet	B-Protocol
predecessor	O
,	O
Pump.io	B-Operating_System
is	O
written	O
in	O
Node.js	B-Language
and	O
uses	O
Activity	B-Application
Streams	I-Application
as	O
the	O
format	O
for	O
commands	O
and	O
to	O
transfer	O
data	O
via	O
a	O
simple	O
REST	O
inbox	O
API	O
.	O
</s>
<s>
Pump.io	B-Operating_System
requires	O
:	O
</s>
<s>
Pump.io	B-Operating_System
can	O
run	O
easily	O
on	O
low-resource	O
hardware	O
(	O
such	O
as	O
a	O
Raspberry	B-Operating_System
Pi	I-Operating_System
or	O
BeagleBone	O
Black	O
)	O
.	O
</s>
<s>
As	O
a	O
distributed	O
social	O
network	O
,	O
Pump.io	B-Operating_System
is	O
not	O
tied	O
to	O
a	O
single	O
site	O
.	O
</s>
<s>
Features	O
that	O
were	O
present	O
in	O
StatusNet	B-Protocol
are	O
still	O
(	O
as	O
of	O
October	O
2017	O
)	O
not	O
implemented	O
in	O
Pump.io,	O
such	O
as	O
Groups	O
,	O
hashtags	O
,	O
and	O
page	O
listing	O
popular	O
posts	O
.	O
</s>
<s>
The	O
W3C	O
Federated	O
Social	O
Web	O
Working	O
Group	O
,	O
launched	O
in	O
July	O
2014	O
,	O
has	O
produced	O
the	O
ActivityPub	B-Operating_System
standard	O
,	O
based	O
on	O
the	O
protocols	O
used	O
in	O
pump.io	B-Operating_System
as	O
a	O
likely	O
successor	O
to	O
OStatus	B-Application
.	O
</s>
