Common Sense Media counts TikTok as video, not social media

The test

Common Sense Media has tracked screen time among American tweens and teens since 2015 through a periodic census. The most recent full wave, formally titled 'The Common Sense Census: Media Use by Tweens and Teens, 2021', was fielded to compare against a 2019 baseline during the pandemic period. The report's methodology section states that the survey ran 'from September 29 to October 25, 2021' among a 'nationally representative, probability-based online survey of 1,306 young people (age 8 to 18) in the United States,' fielded through Ipsos's KnowledgePanel, with an overall margin of error of plus or minus 3.2%.

What the evidence says

The census states that 77% of teens watched online video every day in 2021, up from 69% in 2019, and that average daily viewing time among all teens reached 1 hour 22 minutes, up 23 minutes from 2019, changes the report flags as statistically significant. A separate but easily missed methodological choice shapes how those figures should be read: the report states plainly that 'social media was defined in the survey as being sites such as Snapchat, Instagram, Discord, Reddit, or Facebook; platforms such as YouTube, TikTok, and Twitch were considered online video sites.' That classification means TikTok's daily-use figures in this census sit inside the 'online video' category, not 'social media,' a boundary a different survey may draw differently.

The sample and the variance

The 1,306-person sample was drawn from a probability-based panel rather than an opt-in pool, which Common Sense states makes results 'substantially more generalizable' than convenience-sample research, and Black respondents were oversampled to reach a subgroup base of at least 200. A companion online-video fact sheet drawn from the same fieldwork adds that YouTube, not TikTok, was the site teens most often said they would not want to live without. The survey covers U.S. 8- to 18-year-olds only, fielded over one four-week window in autumn 2021; it cannot support claims about other countries, other years, or age groups outside that band, and its TikTok-as-video classification cannot be merged directly with a survey that counts TikTok as social media without adjusting for the definitional difference.

What to try next

Anyone citing this census for TikTok or YouTube usage should specify that the figure falls under Common Sense's 'online video' category, not 'social media,' before comparing it to a differently defined survey. This is an editorial checklist item, not a Common Sense instruction: check the fielding window and age band before treating any single-year change as a lasting trend.

• Does the cited figure come from Common Sense's 'online video' category or its separately defined 'social media' category?
• Is the comparison being drawn against the 2019 baseline within this same census, or against a different survey's differently defined population?
• Does the claim generalize beyond U.S. 8- to 18-year-olds surveyed in autumn 2021, which this sample cannot support?

A probability-based panel and a stated margin of error make this census unusually citable evidence, provided its category boundaries, not just its numbers, travel along with the citation.