[neysofu]

Why is it still invite-only? They had (have?) A unique opportunity with people begging to use their service... they were in the right place at the right time, and they willingly decided to limit sign-ups and let the hype die. I'm baffled.

[Hamuko]

Last I read, they're finishing up on some architecture upgrades in order to scale the service in the future and that it should be finished by the end of the year. After that, the invites might go away.