The Colorful mystery of Facebook Status Updates.

 If men are wondering why women friends are indicating colors on their facebook updates, this is the reason for it. It is the color of their bra and is apparently to show solidarity to victims of breast cancer. So the males in the network, who yielded to the aping instinct and typed the color they liked, simply to be seen as trendy and hip and part of the most voluble group, well, :) you are in for a lot of attention. LOL.

http://www.washingtonpost.com/wp-dyn/content/article/2010/01/08/AR2010010803693_2.html?hpid=topnews

A critique of this trend is also attached and is worth reading:

http://macvaysia.com/2010/01/09/this-is-really-nuts/

WHY DIGITAL IS INCREASING REACH- INTERNET TRENDS

Linkedin and Facebook are being viewed during office times. Possibly explains the explosive growth in memberships and time spent. It also indicates a growing trend in media and entertainment consumption.
http://getahead.rediff.com/report/2009/dec/22/are-social-networking-sites-killing-productivity.htm