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They have around 25m users according to TC. that makes it about $28 per user. Which is alright, I have seen higher numbers per user.

• grinich 17y ago
  Are those active? I've heard a lot of Twitter's "users" sign up but aren't posting.
  • axod 17y ago
    Also some people create 650 accounts ;) http://news.ycombinator.com/item?id=592438 http://news.ycombinator.com/item?id=592438