According to The Nielsen Company, global* consumers spent more than five and half hours on social networking sites like Facebook and Twitter in December 2009, an 82% increase from the same time last year when users were spending just over three hours on social networking sites. In addition, the overall traffic to social networking sites has grown over the last three years.

Globally, social networks and blogs are the most popular online category when ranked by average time spent in December, followed by online games and instant messaging. With 206.9 million unique visitors, Facebook was the No. 1 global social networking destination in December 2009 and 67% of global social media users visited the site during the month. Time on site for Facebook has also been on the rise, with global users spending nearly six hours per month on the site.

blog.nielsen.com