Hi sorry if you see this twice because I might repost this so. If you see a minor selling nsfw pics or just see them posting them at all. just report the account, PLEASE. This is coming from someone who has done that.

1. Do NOT go undercover because you will end up in a loophole. It is very dangerous and in some parts of the world (such as the US) you can be arrested even if you don't post anything being in the presence of those pictures is enough.
2. In addition, it's such a deep rabbit hole. Like if they have a twitter, they most likely have a discord which leads back to servers where more of these things happen. They might also have a telegram which is worse.
3. Going into their dms and telling them that its wrong wont do anything. Most of the people who are posting this are very mentally ill or their morals are like... really fucked up due to being groomed.
4. Deplatforming them is the best. Because if they keep getting deplatformed they'll eventually give up because you can only be banned so many times before they give up.

Theres more but I don't feel like explaining it all and this is a bit messy but yeah. You can ask more questions about this in my imbox !!