I've tried multiple times with a TikTok account to get me useful videos and its always kids playing some weird games. FB/YT are much better and instantly switching content when I skip past a video.
I get a lot of stuff I care about (some scientific papers overviews, blender/davinci editing tips and tricks, bits of high-quality podcasts) on tiktok, even if I just go for 5 minutes to entertain myself with some audio-visual crap. Mention of its algorithm being responsive matches my observations here.