And after all this, Twitter still does not have a viable business model.
...more pertinently, App.net didn't have one either - and they had an open API, charged real money and did all the things HNers' idealized version of Twitter would.
Interesting. I'd expect something entirely opposite - with one platform, pay-for-entrance, shills / marketers can just write the entry costs off as a small marketing expense. OTOH I can easily imagine a lot of smart people with interesting things to say shying away from spending money on such a platform.