Though such sites as Instagram and Snapchat increasingly appeal to teenagers, Facebook is still a "dominant force", the survey found.Among the more than 1,000 teenagerss surveyed, 71 percent said they use Facebook, while 41 percent said Facebook is the site they use the most frequently over all other social networks.Instagram and Snapchat scored as the second and third most frequently used sites, respectively.

Some surveys had concluded that Facebook's popularity among teenagers has dropped over the past few years.According to the new Pew survey, most teenagers spend their time on more than one social network.But among the 22 percent who still use only one site, 66 percent pick Facebook, 13 percent use Google+, 13 percent Instagram and 3 percent Snapchat.Boys were more likely than girls to say they visit Facebook most often (45 percent of boys versus 36 percent of girls).

Girls polled were more likely than boys to say the same for Instagram and Tumblr.Older teens from 15 to 17 years old were more likely than younger teens aged 13 to 14 to point to Facebook as their most used site (44 percent of older teens versus 35 percent of younger teens).

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