How many popular web2.0 sites do you know?

Image by tattoodjj via Flickr

there are now 14 popular web2.0 sites I like very much, what are yours?

1 Myspace.com
2 wordpress
3 Flickr
4 Youtube
5 Revver and Metacafe
6 Newsvine
7 Yahoo
8 Digg
9 Skype
10 facebook
11 del.icio.us
12 Google
13 37signals
14 Netvibes