Social media is an advertising platform. YouTube is a form of social media that's profitable too, at least now, and it's all from ads.

I'm not sure that's really necessarily a sign of that tbh. Answering AMA's starting with A: was pretty common on reddit back in the day.

Well, TikTok is the most recent contender. ByteDance is a private Chinese company though, so it’s hard to get accurate numbers.