That represents a major shift in the social media landscape that Facebook commanded as recently as Pew's 2014-2015 survey, and represents another blow for a company that's attracted widespread criticism of its data privacy practices in the wake of the Cambridge Analytica scandal.
By comparison, during Pew's 2014-2015 survey, only 24 per cent of teens said there were online nearly constantly.
Use of Facebook was markedly higher among lower-income teens, with 70% of those living in households earning less than $30,000 a year using the platform, compared with just 36% of those whose annual family income is $75,000 or more. YouTube was not included in the 2014-2015 survey.
Facebook usage lags behind rivals such as YouTube, where 85% of teens say they spend their time. The world's largest social network has finally been eclipsed in popularity by YouTube, Snapchat and Facebook-owned Instagram. White teens were more likely to use Snapchat and black teens were more likely to use Facebook.
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Meanwhile, Twitter followed at 32%, and Tumblr's popularity (14%) remained the same since the 2015 survey.
"Depending on Facebook's continued evolution, as these teens grow older and go through different life events, they may again embrace Facebook", said LSA's Sterling.
Furthermore, 84 percent of teens have access to a game console and 90 percent say they play games of any kind.
Nearly half the teenagers in the United States (45 percent) are online almost constantly-but many have left Facebook in favor of other platforms. In fact, 45% of the teens surveyed said they use the internet "almost constantly". According to the study, one-third of the subjects taken in the survey said Facebook had a positive impact in their life whereas a quarter said it had a negative impact. And, Anderson noted, one of the key themes in their study was the idea that teens "felt that social media caused distraction".