In 2022, there were ~25.1 million teens[1], of whom ~67% used TikTok[2], for a total of ~16.8 million on TikTok (totally ignoring anyone under 12 or over 17).
I know the numbers are hacky because the first group includes younger children and the second group doesn't (and 1/3 of TikTok's users could be under 14[3]), but I was trying to get a sense of scale for each category. Assume the TikTok user count is probably an underestimate.
My hacky numbers come up with a bit over 40x more teens being first-hand infuenced by tiktok. To make the numbers even more hypothetical, the next step of deciding how many times worse you think being enrolled at a school that has a shooting is for students and plugging that in to get how much more attention/resources should be used on shootings is left as an exercise for the reader.
[0] https://github.com/washingtonpost/data-school-shootings [1] https://www.childstats.gov/americaschildren/tables/pop1.asp [2] https://www.pewresearch.org/internet/2022/08/10/teens-social... [3] https://www.nytimes.com/2020/08/14/technology/tiktok-underag...