I intentionally avoid things like TikTok because I've experienced how incessantly and constantly addictive it is. But then again, I'll also avoid particularly long TV series, games without definitive ends, etc. I think TikTok et al are unique because you're "doing something" but the effort expended to get that next hit is extremely minimal. Even though I can sink hours into Factorio, it's challenging and exhausting. I might be able to binge a TV series, but eventually I'll want to do something. TikTok hits a perfect blend of "doing" and "experiencing" that makes it endlessly addictive.