Fool me once...
It reads as very self-serving for these folks to create a business model that is clearly economically unsustainable and fueled only by venture capital, then sell their company to Facebook for billions of dollars -- and then to pretend like they're shocked that Facebook wants to make their money back.
Of course they do. You knew that. We all knew that. And you still sold your business anyway. That's fine -- good job -- we're happy for you -- but don't act holier-than-though now that you're rich and bored. And don't start a new company backed by venture pretending you're not hoping to do it all over again.