I’ve been thinking about the medium and long term — by which I mean 5-10 years and 15-30 years from now; the tech world changes so quickly that anything beyond that is sheer guesswork — and trying to imagine when, how, and if Facebook will wither away. Warren Buffet always advises investors to buy a company with “moats” defending them from competitors, and Facebook has one of the deepest and most dragon-laden moats in the world. First, of course, there’s the network effect; with a billion active users, everyone goes there because that’s where everyone is. Read the full story at TechCrunch.