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Whether it’s actually a celebrity taking advantage of starstruck young fans on social media—See: recent allegations against Brand New’s Jesse Lacey, various YouTube personalities—or some random creep pretending to be a celebrity to gain access to starstruck young fans on social media, here’s a cool new rule for you social-media-loving teens: If a grown, “famous” man tries to hit you up on Facebook, block him immediately.

That’s the gist behind Chris Pratt’s warning to female fans, particularly kids, on Instagram yesterday. In his post, he says that there’s at least one fake “Chris Pratt” account that’s been harassing women on Facebook, “trying to get their numbers and who knows what else.” He adds the common-sense warning to check for a blue verified checkmark next to the name if someone claiming to be a celebrity contacts them on Facebook—which, again, there’s really no good reason for them to be contacting you in the first place, especially if you’re underage—and says, “If I find out who it is I’ll have their account shut down and seriously would like to punch them right in the GD mouth.”