Thanks for the answer. I just want to ask one more question. Don't you think StackOverflow is already too large to disappear suddenly like those startups you mentioned, and smart enough to NOT go the way of ExpertsExchange? (I think the founder explicitly mentioned StackOverflow wanted to be an anti ExpertsExchange when they launched. Also I don't think the company would be stupid enough to alienate their users which will lead to demise regardless of how much content they already have)