This sentence made me chuckle: > But, to this day, there are more people in the world without an account on Facebook than people with one. So that's an upper

This sentence made me chuckle: > But, to this day, there are more people in the world without an account on Facebook than people with one. So that's an upper bound of what, four billion people? I think basically anyone watching would consider that a success! When people are wondering which social network will "succeed", they're not watching the different apps duke it out like a sports tournament. They just want to find a space in which they can communicate with most of the people they care about.