Can you send me a picture of you not naked, my mom wants to see what you look like
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And then after that, send me more pictures of you naked. And then come over, and be naked, too.
That's what facebook is for. And if she's a shit show on fb, they would soon find out regardless.
If they don't send a clothed pic, you could just say they are a nudist. This tactic has the added benefit of them being naked when they come over in order to keep up appearances.