FILE -- Isabella Cimato, 17, from left, Arianna Schaden, 14, and Sofia Harrison, 15, check their phones at Roosevelt Field shopping mall in Garden City, N.Y., on July 27, 2015.

Nearly half of American teenagers say they are online "constantly" despite concerns about the effects of social media and smartphones on their mental health, according to a new report published Thursday by the Pew Research Center.

As in past years, YouTube was the single most popular platform teenagers used -- 90% said they watched videos on the site, down slightly from 95% in 2022. Nearly three-quarters said they visit YouTube every day.

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