How The World Spends Its Time Online

Nielsen periodically releases data from its studies of consumer behavior online. Here are the latest findings regarding social networking brands, and worldnet usage.

Sources: 
Neilsen  
Visualeconomics

How Are Mobile Phones CHANGING Social Media?

Social media is a natural sweet spot for mobile since mobile devices are at the center of how people communicate with their circle of friends, whether by phone, text, email, or, increasingly, accessing social networking sites via a mobile browser.

Sources:

Flow Town

Information Week

Comscore

Facebook

Facebook Blog

NPR

Read Write Web

Nielsen Blog

10 Levels of Intimacy in Today's Communication