[frade33]

They actually don't want to do anything with them. And I don't even get, how they would keep grabbing their rivals without triggering anti-trust investigation.

As soon as any social startup rises to the sky, they would grab it. Since the social itself is worthless in terms of making money, so anyone would easily get acquired, because they don't have any other choice, and definitely acquisition by Facebook, Apple, Google or Microsoft is and was their only business model.