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It's Twoorl (http://twoorl.com), of course :) Twoorl is open source and it's written in Erlang.

Twoorl is just a clone of Twitter, whereas Myspace extended past Friendster's features and made it its own site.

Plurk and Pownce are different enough from Twitter that they're not seen as just clones, that they fall into the competitor's department.

Twoorl started as a Twitter clone, but it doesn't mean it'll stay as such.