More than three quarters of online American teens use Facebook

"Ever since Facebook CFO David Ebersman admitted last October that young teens were visiting the site slightly less frequently, most have accepted as fact that young people are fleeing Facebook en masse. Ivy League researchers have forecast that the service will be all but dead by 2017; President Obama recently claimed that young people “don’t use Facebook anymore”; and when comScore recently reported that fewer college students were using Facebook, media outlets ran stories on the “social platforms college kids now prefer.”
But if you take a closer look at the data it tells a very different story. Sure, many data sources show that Facebook’s usage among young people has declined slightly — but the drops are small, and the huge majority of this audience still uses the site. For instance, that comScore report only found a three-percentage-point drop in college-aged adults’ Facebook usage and reported that 89% of this audience still used Facebook — far more than used any other social site.
To investigate teens’ social behaviors further, we recently asked 4,517 US online youth (aged 12 to 17) not just whether they use social sites like Facebook, Instagram, Snapchat, and Tumblr — but if they use those sites “about once a day,” “at least a few times each day,” or even if they were on any of the sites “all the time.”
The results were clear: Facebook remains young users’ favorite social network. More than three-quarters of online youth use Facebook — twice as many as use Pinterest or Tumblr or Snapchat, and more than use Instagram and WhatApp combined. And 28% of young users who are on Facebook say they use it “all the time,” a higher percentage than said this about any other social network."

Source:  Blog post by Forrester's Nate Elliott, 24th June 2014