How can you warn others about your abusive ex?

I recently left my ex who was physically abusive. It took me a year to get away, Block all his socials as well as change my number. After a week, finally stopped making fake social media’s just to contact to me and he stopped emailing me but what sucks is we associate with the same friends/people. We met through our mutual friends. That’s how we started dating and they have been telling me he’s been on social media, snap chat In particular, saying he’s looking for a girlfriend and that he’s single and it doesn’t bother me that he’s looking for a new relationship just that quick. That’s who he is. He doesn’t know how to be alone, my only worry is some poor girl will fall for him like I did and end up in my same situation, possibly worse.
How can you warn others about your abusive ex?
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