<s>
Simple	B-Protocol
Update	I-Protocol
Protocol	I-Protocol
,	O
or	O
SUP	O
,	O
is	O
a	O
protocol	O
developed	O
by	O
FriendFeed	O
to	O
simplify	O
and	O
speed	O
up	O
RSS	O
and	O
Atom	B-Application
feed	I-Application
updates	O
.	O
</s>
<s>
These	O
sites	O
include	O
Disqus	O
,	O
Identi.ca,	O
reddit	B-Application
.	O
</s>
<s>
SUP	O
introduces	O
SUP	O
feeds	O
,	O
which	O
are	O
lists	O
of	O
RSS	O
and	O
Atom	B-Application
feeds	I-Application
that	O
have	O
updated	O
recently	O
.	O
</s>
<s>
A	O
feed	O
consumer	O
(	O
like	O
FriendFeed	O
,	O
or	O
a	O
feedreader	B-Application
)	O
can	O
regularly	O
poll	B-General_Concept
a	O
small	O
number	O
of	O
SUP	O
feeds	O
instead	O
of	O
polling	B-General_Concept
each	O
individual	O
feed	O
.	O
</s>
<s>
RSS	O
and	O
Atom	B-Application
feeds	I-Application
are	O
identified	O
in	O
SUP	O
feeds	O
by	O
an	O
opaque	O
,	O
unique	O
identifier	O
derived	O
from	O
their	O
URL	O
.	O
</s>
<s>
SUP	O
feeds	O
are	O
intended	O
to	O
be	O
managed	O
by	O
services	O
that	O
publish	O
large	O
amounts	O
of	O
RSS	O
and	O
Atom	B-Application
feeds	I-Application
,	O
though	O
FriendFeed	O
also	O
hosted	O
a	O
public	O
SUP	O
feed	O
which	O
anyone	O
could	O
post	O
updates	O
to	O
.	O
</s>
<s>
Brightkite	B-Language
supported	O
SUP	O
but	O
was	O
itself	O
shutdown	O
in	O
April	O
2012	O
.	O
</s>
<s>
YouTube	B-General_Concept
's	O
API	O
v2.0	O
supported	O
SUP	O
,	O
but	O
that	O
version	O
of	O
the	O
API	O
was	O
deprecated	O
in	O
2014	O
and	O
YouTube	B-General_Concept
's	O
SUP	O
feed	O
was	O
eventually	O
shut	O
down	O
.	O
</s>
<s>
YouTube	B-General_Concept
data	O
API	O
v3	O
supports	O
PubSubHubbub	B-Application
instead	O
.	O
</s>
