Report the crime - Anonymously report with as much information as possible based on your country's government. Resource list here.
Please please do not be afraid of getting in trouble. The right thing is to report the evidence you have so the crime may be handled. At the very least, report with full anonymity.
Report their account - Accounts can be deleted on every social media, but for someone who wants to commit crimes, this does close to nothing to stop them since they can just make new accounts - but it's still good to report their account without saying anything.
Cut contact - Cut the abuser out of your community as best you can.
If that part is difficult, then please reach out to us and explain why so we can try to help (and get more research on that) - We do not have a formal thing for this yet, but if, for example, there's a predator using multiple accounts to harass multiple communities you're in, we can help with bots or something to try to fit specific needs.
Think about prevention - I am encouraging you to take a bit more responsibility now. Think about how to keep your online area safe from any possible people like this. Think about how to separate others & yourself from abusers/abusive sites by any means.
What we can do for you:
Look into this person a little more and collect a bit of information to send to authorities
Help you get proof, or help structure information
Help you find resources
Help you share your story
Help you make an anonymous report
Help you find ways to be safe online based on your needs
I'm encouraging you to reach out and ask for help when it comes to reporting, since our community knows that there are unique methods of abuse showing up all the time - We also know that a depressing amount of abuse related crimes go unreported - this project is meant to be a safe place to figure out what to do after online abuse happens.
For minors reaching out - please always keep in mind to be safe reaching out to anyone even if they seem trustworthy. Here's some info on manipulative tactics, and please don't share ANY personally identifiable information.