Again, I just don't think this issue is as simple as you portray it. There is a place for critics and criticism in society, a society with them is healthier I think than a situation (as you seem to, forgive me if I misread you, be promoting) where the only thing worthwhile is creating a startup, and if you have not or are not actively creating a startup and achieving the current consensus definition of success, then your opinion is worthless.

Perhaps Greenspan is, as you say, just a whiner. But he does seem to have a lot of experience in tech, have come up with a lot of different ventures, and, very importantly, he was there in the early days of Facebook, he saw Mark and experienced Mark's behaviour first-hand way back in 2004. Say what you will, I think that experience is important. Facebook is a massive force in current history, and Mark by-and-large defines Facebook's culture. So yeah, I think this stuff matters. Are you saying that we should discount Greenspan's opinions automatically, because what, he's too bitter, or has complained too much already, or hasn't created something nice and shiny and new recently?