Social media is becoming a dominant force in the lives of teenagers.

During the last six years, social media use among U.S. teens aged 13 to 17 has increased dramatically, with 70 percent checking social media platforms multiple times a day, up from 34 percent in 2012, according to a study from Common Sense Media. The San Francisco-based nonprofit studies how tech and media impact kids. One of the driving factors behind this trend is growing smartphone ownership among teenagers, which has more than doubled, from 41 percent in 2012 to 89 percent today, the study said.

At the same time that teens are increasingly using social media apps like Facebook, Instagarm and Twitter, they admit to being wary of the companies behind these platforms. One in three teenagers believes that tech companies are manipulating them to spend more time on their devices, according to the study. The percentage who say they feel “addicted” to social media has risen only slightly, however, from 20 percent in 2012 to 24 percent today.

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