Simple Update Protocolwikipedia
Simple Update Protocol, or SUP, was a protocol developed by FriendFeed to simplify and speed up RSS and Atom.
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FriendFeed
Simple Update Protocol, or SUP, was a protocol developed by FriendFeed to simplify and speed up RSS and Atom.
Employees of FriendFeed created the Simple Update Protocol to reduce the load put on sites by aggregators such as theirs.

SUP
Simple Update Protocol, dropped proposal to speed RSS and Atom
RSS
RSS feedsRSS feedReally Simple Syndication
Simple Update Protocol, or SUP, was a protocol developed by FriendFeed to simplify and speed up RSS and Atom.


Atom (Web standard)
AtomAtom Publishing ProtocolAtom Syndication Format and Atom Publishing Protocol
Simple Update Protocol, or SUP, was a protocol developed by FriendFeed to simplify and speed up RSS and Atom.
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Disqus
Disqus commenting widget
A few websites supported SUP for a while, meaning that updates from their services appeared in FriendFeed within seconds, until support was dropped, and eventually FriendFeed itself shutdown 2015-04-09. These sites include Disqus, Identi.ca, reddit.
Identi.ca
A few websites supported SUP for a while, meaning that updates from their services appeared in FriendFeed within seconds, until support was dropped, and eventually FriendFeed itself shutdown 2015-04-09. These sites include Disqus, Identi.ca, reddit.
Reddit
subredditReddit AMAAMA
A few websites supported SUP for a while, meaning that updates from their services appeared in FriendFeed within seconds, until support was dropped, and eventually FriendFeed itself shutdown 2015-04-09. These sites include Disqus, Identi.ca, reddit.



Brightkite
Brightkite supported SUP but was itself shutdown in April 2012.
YouTube
youtube.comYouTube channelYoutuber
YouTube supported SUP according to YouTube v2 API SUP documentation, yet as that reference says "The YouTube Data API (v2) has been officially deprecated as of March 4, 2014."








WebSub
YouTube Data API (v3) supports push notifications via PubSubHubbub instead and no longer has SUP section.