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SUP stands for Simple Update Protocol, is a JSON-based meta format for RSS/ Atom feeds useful for websites that deliver a large number of feeds, like a blogging platform, so that services subscribing to that site’s RSS feeds only need to download a single file to check for updates, and then download the other individual feeds as needed. SUP was invented by the ex-Google employees Paul Buchheit and Gary Burd of (recently redesigned) social feed aggregator Friendfeed. There is no official documentation at the moment outside of the Python source.

Source:→ Google Blogoscoped