
State of the Media: U.S. Digital Consumption Report, Q3-Q4 2011. The study found Internet users spend 21.3% of their time on social networking sites. This report shows a much smaller percentage of time spent on Internet portals like Yahoo!
link: http://www.socialmediaexaminer.com/5-social-media-tips-for-finding-and-engaging-your-target-audience-new-research/