On the other hand, I guess Facebook really does not want to do that, because it would create an opening to attack Facebook. Right now, you can't compete with th

On the other hand, I guess Facebook really does not want to do that, because it would create an opening to attack Facebook. Right now, you can't compete with the network effects of Facebook's size, however if 10% or so of all Facebook users are up for grabs, and they are also correlated by region, then you could build a European Facebook competition and capture a strong enough base to effectively compete with Facebook. (Initially at least in Europe, however pretty quickly many people in the rest of the world would also have a 'European Facebook' account and then Facebook can't just rely on everybody is on Facebook anymore.) I would actually be quite interested how that one plays out, I really don't have a good intuition of how that would look like.