Networking sites

[chickenfeet]

There seem to be a huge number of social or business networking sites. I wonder who uses which, so a poll...

[Poll #958831]

Comments

[chickenfeet2003.livejournal.com]

I guess not ticking any of the boxes equates to "none of the above".

I'm curious about relative popularity and what kind of person is using which site. I figured 'what for' would probably emerge in comments.