Top Most Popular Social Networking Websites:
1 Facebook
2 MySpace
3 Twitter
4 Linkedin
5 Ning
6 Tagged
7 Classmates
8 Hi5
9 Myyearbook
10 Meetup
11 Bebo
12 Mylife
13 Friendster
14 MyHeritage
15 Multiply
16 Orkut
Most Popular Social Bookmarking Websites
1 Twitter
2 Digg
3 Yahoo! Buzz
4 Reddit
5 StumbleUpon
6 Delicious
7 Tweetmeme
8 Mixx
9 FARK
10 Slashdot
11 Friendfeed
12 Clipmarks
13 Newsvine
14 Diigo
15 Propeller