The C.S. Mott Children's Hospital National Poll on Children's Health found that 32% of children ages 7 to 9 and 49% of children ages 10 to 12 use social media apps. The findings, based on a survey of 1,030 parents, also showed that 35% of parents said their child was taught about the safe use of social media apps in school, and that these parents were more likely to report that their child uses these apps.
National Poll: 1/3 of children ages 7-9 use social media apps. (2018). https://www.eurekalert.org/news-releases/931448.