43 Things

43 Things is a social networking website established as an online goal setting community.^[2] It is built on the principles of tagging, rather than creating explicit interpersonal links (as seen in Friendster and Orkut). Users create accounts and then list a number of goals or hopes; these goals are parsed by a lexer and connected to other people's goals that are constructed with similar words or ideas. This concept is also known asfolksonomy. Users can set up to 43 goals, and are encouraged to explore the lists of other users and "cheer" them on towards achieving their goals.

History 

43 Things was launched on January 1, 2005, by the Robot Co-op, a small company based in Seattle founded by blogger Erik Benson, Maktubkeyboardist Daniel Spils, and former Amazon.com and Microsoft executive Josh Petersen.

Critique 

According to "43 Things: A Community Study," 43 Things has two shortcomings: (1) it fails to have a central area containing documentation about the website and (2) it relies heavily upon RSS, which is unfamiliar to a large portion of users. Other than that, it is basically user friendly, and has received solid reviews in regards to responsiveness and user suggestion integration.

Awards 

In 2005, 43 Things won the Webby Award for the best social networking site.

Reference: 

http://en.wikipedia.org/wiki/43_Things