In service of the parent task, there's something that would help @nshahquinn-wmf with his analysis. We're not sure the best way to detect in-app browser traffic to our site in other apps (i.e. someone is in their TikTok app, they click a link to Wikipedia, and the article opens in TikTok's in-app browser, as opposed to Safari or Chrome). Though this question is not about the Wikipedia iOS or Android apps, @JMinor suggested that people who work on our apps would have a sense of how this might work in other apps (and suggested that @SNowick_WMF might know the answer).
The question is: what could we be looking for in the referral URL, or in the user-agent, or elsewhere to see whether traffic came from TikTok?
Thank you for any insight you can give (over the next week or so)!