1. Google Friend Connect
2. Facebook
3. MySpace
4. hi5
5. LinkedIn
6. Tagged
7. Ning
B. Blog Applications & Sites
1. Yahoo! Shortcuts
2. Blogger
3. WordPress
4. Kindle Publishing
5. TypePad
6. Wordpress for iPhone
7. Technorati
C. Bookmarking Applications & Sites
1. Digg
2. Stumbleupon
3. AddThis!
4. bit.ly
5. Delicious
6. diigo
7. Jumptags
