How much time do you spend on social networking sites like Facebook and Twitter. The answer will differ from person to person, but can you guess how much time an average user spend tweeting and facebooking?

According to a survey by The Nielsen Company, the average social network user around the world spend more than five and a half hours on sites like Facebook and Twitter in December 2009. This is an 82 percent jump from December 2008 when Tweeters and Facebookers spend around three hours the entire month.

Social Networks and blogs proved to be the most popular sites in December. Facebook was the top social-networking site in December with 67% of social networking users around the world.

Among all countries, the United States led the way with the largest number of people checking out social-networking sites at 142.1 million unique visitors.

Australian users top the list of most time spend at social-networking sites with almost seven hours for the month, while U.S., U.K., and Italy users spent around six hours.

Although, Japan came in the number of unique visitors with 46.5 million users after the United States, it had a much lesser average usage time of around 3 hours.