Facebook has so much momentum, it's hard to imagine anyone competing with them head-on. X will stay on Facebook because that's where [A, B, C] are, and B isn't

Facebook has so much momentum, it's hard to imagine anyone competing with them head-on. X will stay on Facebook because that's where [A, B, C] are, and B isn't going to switch because that's where...... I would guess that the only way to compete against Facebook is to target smaller, more specialized kinds of social and try to bring them together. Also, they need to focus on under-served markets (women, emerging markets, elderly). If they can get to these before Facebook does, they'll create the same kind of momentum.