TikTok has emerged as a major challenger to the current Meta-dominated social media landscape, capturing about 10% of all attention of American users. In contrast, we estimate that Meta social media and instant messaging properties capture about 48%.

• TikTok users skew far younger than for most other social media. TikTok is also used by more non-White respondents; people with a high school or less education, and moderately, if consistently, by more women than men, and Democrats than Republicans.