Nielsen: Twitter and Facebook Use up 82 Percent

"We're spending a lot more time tweeting and Facebooking, says Nielsen.

The average social-networking user around the world spent more than five and a half hours on sites like Facebook and Twitter in December, according to data released Monday by Nielsen. That marked an 82 percent jump from December 2008 when Tweeters and Facebookers surfed their favorite sites for around three hours the entire month." source