Earlier quoted context omitted.
> Where's the evidence that suggests that millions of people care about this distinction enough to pay for it? Where's the evidence that suggests millions of people have to join?
Isn't that self-evident? People post to Facebook and Twitter to be heard. Currently, they seem to post on App.net about App.net. That's not sustainable. Personally, I use Twitter mostly to talk to people in the fields I work in, namely hacking and journalism. I don't see how either of those communities will move to App.net wholesale. If you want me to pay money just to have a conversation with you, I'm probably going…
My first post on Twitter was "trying to figure out WTF Twitter is". I subsequently didn't post for six months. I wouldn't judge the platform on what's posted in the first 30 days of existence. As for sustainability, $500k in revenue is more than Twitter had for years.