Facebook sees further decline in usage among teens

The portion of 13- to 17-year-old social-media users in the U.S. on Facebook slipped to 88 percent this year from 94 percent in 2013 and 95 percent in 2012. In the same period, Twitter Inc. and messaging applications rose in popularity in that age group, according to a recent report by Frank N. Magid Associates Inc. The Menlo Park, Calif.-based company first warned a year ago that teens weren’t using its website as often as before. Facebook stopped discussing teen usage on its earnings calls after last year’s disclosure alarmed investors.

"If kids are starting to use so much of their daily time on messaging apps, surely it’s going to hurt somebody," said Tero Kuittinen, a managing director at Magid in New York.

Among 13- to 17 year-olds, Twitter usage climbed 2 percentage points to 48 percent, according to the report.