Tumblr , the fast-growing lightweight blogging platform, is constantly adding new features. Tumblr’s latest move is to start pushing users’ blog updates in real time, using PubSubHubbub (try saying that 10 times fast). Tumblr’s real-time will be powered by Superfeedr , which is the same service used by Tumblr competitor Posterous . This is more of a step for the future than a right-now sort of thing, because most RSS readers don’t support PubSubHubbub yet. To get these fancy new real-time updates, instead of the old-fashioned RSS ones, you can use Friendfeed, Lazyfeed, or the new Netvibes Wasabi.

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Tumblr starts pushing real-time updates via PubSubHubbub

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