#1 Facebook.com

More time is spent on Facebook than any other site. The site attracts 10.8 percent of time online, has 10.8% of time online with 150.3 million desktop visitors and 97.7 million mobile visitors.

Of all time spent on social networking sites 83 percent is spent on Facebook. The company has made significant inroads in mobile, with time on Facebook's Smartphone applications making up 23 percent of all time on apps.

According to a study by the Pew Internet and American Life Project, 61 percent of the site's active users have taken a multi-week break from the social network at some point. Furthermore, 27 percent of people surveyed said they planned to spend less time on Facebook in 2013, while only 3 percent intended to spend more time on the site.

Read also: 10 Most Frustrating Things About Being A Programmer and 7 Most Valuable Tech Brands Of 2013