SUP (Simple Update Protocol) is a simple and compact "ping feed" that web services can produce in order to alert the consumers of their feeds when a feed has been updated. This reduces update latency and improves efficiency by eliminating the need for frequent polling. To learn more about SUP, see the documentation or the SUP FAQ.
For smaller publishers, it may be easier and more efficient to contribute updates to a shared SUP feed hosted elsewhere, instead of generating their own SUP feed. FriendFeed provides a public, shared SUP feed that is open to updates from anyone.
To utilize this shared SUP feed, publishers must:
# Use the first ten hexadecimal characters of the MD5 hash of the url supid = hashlib.md5(url).hexdigest()[:10]
To see an example request, enter your Atom or RSS feed URL below. This will show the URL used to add an update to FriendFeed's public SUP feed, and the corresponding HTTP header or link tag to include with your RSS or Atom feed.