Tagfoot is kind of hard to describe. It's similar to Delicious (and you can import your Delicious bookmarks, if you want). It offers social networking features.
I didn't know what I would think when I was invited to give it a try, but I took to it like a fish to water.
Some of my friends say it is confusing, but this is one site that just felt right to me. Of course, your mileage may vary.
Here's my profile: http://tagfoot.com/johndilbeck
It's currently in beta, but you can give it a try, if you want:
Beta invitation: http://tagfoot.com/sign_up.johndilbeck
Act on your dream!
JD