My sense is that cross-platform following can mostly be achieved by RSS subscription, although following does include a notification aspect. For example, in both Typepad and Tumblr I can expose the list of those that I am following, and those that are following me. Various platforms need only to notify each other of following and unfollowing, and the identities involved, and then cross-platform following semantics works.
I agree with using RSS subscription as a cross-platform following mechanism but I’d stop there. If you’re gonna use RSS over HTTP then you can use the unique visitors metric as your “followers” count and the referrer information to find out who those followers are.
This, of course, only makes sense if you have a ready to use application that manages all those metrics for you.
Read the original: More On Cross-Platform Tumbling: Following Is Mostly RSS on /Message.
Great news for all RSS advocates: Dave Winer somehow convinced Matt Mullenweg to automatically support RSSCloud on all WordPress.com blogs.
Quoting ReadWriteWeb, who apparently broke the news:
All blogs on the WordPress.com platform and any WordPress.org blogs that opt-in will now make instant updates available to any RSS readers subscribed to a new feature called RSSCloud. There is currently only one RSS aggregator that supports RSSCloud, Dave Winer’s brand-new reader River2. That will probably change very soon.
If you have a WordPress.org blog, you can easily install the recently launched RSSCloud plugin, by Joseph Scott, an employee of Automattic, the company behind WordPress.
Now, how will RSSCloud compare to PubSubHubbub? As Chris Messina points out on a comment to Dave Winer’s announcement, “it’d be nice to either protocol gain adoption and enable a better P2P push-based infrastructure to rise up.”
Let’s see how both technologies evolve. So far RSSCloud is only being used by a single feed reader but has gained a massive number of publishers through the WordPress.com adoption.
PubSubHubbub is ahead in the game, currently being used by Feedburner, Blogger, Google Reader, Google Latitude, YouTube, PicasaWeb, FriendFeed, LiveJournal and Superfeedr, to name just a few. There’s also a WordPress.org plugin, written by Josh Fraser.