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Re:TikTok: All under-16s' accounts made private by dsrees on Wednesday January 13, 2021 @08:48AM (#25761887)
Not a tiktok user, but I know instagram also fills your explore feed with the content that your friends like. So even if you're tailoring your likes to appropriate posts, your friends may not be.
Re:TikTok: All under-16s' accounts made private by rchaud on Wednesday January 13, 2021 @12:00PM (#25764766)
That may just be the initial period after a user has signed up and hasn't engaged with enough content for IG to show anything under "Discover". They may use friends' preferences as a placeholder.

I know for a fact that what's on my Discover feed (surrealist art, UX/UI stuff, Newfie dog videos) is unique to me.