Senh: Twitter can't go public until they can demonstrate some kind of revenue stream. Looks like they're getting private money to make that happen. Without a decent revenue stream, they can't go public. They can, but it would probably tank after the initial round of trading.
Senh: I have to say, I'm impressed. I didn't think anyone would pay for virtual items, but Zynga made that happen. $7B is not bad for a company that just makes Facebook apps.