Also, it's not "too late" - if it were too late, I doubt they'd be getting 31,000 new members per day. People like it because it's different. Sure, it'll probably slow down a lot after a while, but that's not the point. If social media is to truly stay alive, new networks will pop up and old ones will die. They just haven't been around quite long enough for us to see this take full effect yet.