https://apnews.com/0175f191ffc043c99907b1e56e815fcc > NEW YORK (AP) — YouTube is dominating social media use among teenagers, as Facebook fades from popularity, according to a new survey. > A Pew Research Center survey shows that 85 percent of U.S. teens, ages 13 to 17, use YouTube, compared with 72 percent for the Facebook-owned Instagram and 69 percent for Snapchat. Use of the main Facebook service is at 51 percent among teens, down from 71 percent in a 2014-2015 Pew survey. Pew didn't speculate on a reason for the drop, though historically, teens often shun services once they become mainstream — and used by their parents.