The big problem is how you view Early Adopters. You think early adopters are the people who got on facebook when it was open to non college students. That is not the real early adopters. As a True Early Adopters Sr year of College Facebook first came out I still find myself very active. People are not leaving facebook because there is no where else to go. Twitter is nice for quick chats and meeting new people but facebook is the utility that keeps any important connection/friend.