San Francisco: Facebook Inc. is getting less and less cool, at least among teens.

A report on Friday by Frank N. Magid Associates Inc. found that the portion of 13-17-year-old social-media users in the US on Facebook slipped to 88% this year from 94% in 2013 and 95% in 2012. In the same period, Twitter Inc. and messaging applications rose in popularity in that age group, the study showed.

The Menlo Park, California-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. While the issue was all but forgotten as the company’s advertising revenue reached new highs, it’s a bigger concern now, according to Tero Kuittinen, a managing director at Magid in New York.

“You look at Facebook and you say, ‘Wow, something really changed in 2014,’" Kuittinen said. “If kids are starting to use so much of their daily time on messaging apps, surely it’s going to hurt somebody."

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

While more people use Facebook and its messaging app than any competitor, its user base tends to be older, with 55% of Facebook Messenger users being 37 or younger. By the same measure, 86% of Snapchat Inc.’s users and 83% of Kik Interactive Inc.’s users are under 37. Facebook sought to buy Snapchat last year for more than $3 billion, and was rebuffed.

Vanessa Chan, a spokeswoman for Facebook, declined to comment on Magid’s report.

Trust, fun

One reason for the decline in teen Facebook usage is due to concerns that the service may not be trustworthy. Just 9% of those surveyed described the website as “safe" or “trustworthy," while almost 30% of people said they would use those words to describe Pinterest. Pinterest also ranked higher in “fun," with 40% saying so compared with 18% for Facebook.

“Facebook has been so deeply embedded in the lives of the people that the fade is going to be slow," Kuittinen said. “People just start being vaguely dissatisfied and then after a while they stop using it."

Facebook chief executive officer (CEO) Mark Zuckerberg has been working to diversify the company’s offering beyond the main Facebook application. He acquired Instagram, the photo-sharing application, in 2012 and this year, Facebook purchased WhatsApp Inc., which makes a messaging application, for $18 billion. Bloomberg

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