[raydev]

Myspace was for young online people. I was on Myspace. It was tough to even convince half of my friends during that time that being online was fun, let alone being on a social network that didn't really facilitate communication.

Digg was for nerds and nerd-adjacent people. Not sure why you'd even mention it in the same breath as Twitter.

Twitter's scale is so massive, the social graph so varied, that a true replacement is probably years away. It's not impossible for a competitor to take over, of course. Just unlikely.