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Also create mobile clients for everybody to use. And don't forget about an API.

I don't think this will be an issue if he manages to maintain the same API as Twitter.

How many Twitter clients support third-party API endpoints?

Ironically, I believe Tweetie 2 used to, before Twitter bought it. It allowed a lot of advanced customization.

It actually still does, for now. I wonder if the #dickbar shows up on third-party timelines...