| | Stumbleupon http://www.stumbleupon.com/ stumbleupon discovers web sites based on your interests, learns what you like and brings you more. |
| | Diigo http://www.diigo.com/ Diigo is a powerful research tool and a knowledge-sharing community. |
| | Facebook http://www.facebook.com/ Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with friends, upload an unlimited number of photos, share links and videos, and learn more about the people they meet. |
| | 43 Things http://www.43things.com/ A social networking site where users create accounts and then share lists of goals and hopes. |