Study: portion of social media users aged 13-17 on Facebook slips to 88%, down from 94% last year Sarah Frier / Bloomberg : Bloomberg 2014-12-20 Sarah Frier Facebook, Sarah Frier Related Coverage View article Mashable View article bizjournals View article CNET View article Business Insider View article Tech Times View article InvestorPlace View article The Verge View article TIME View article Benzinga View article NBC Bay Area