Need help pleas

someone made a site voting template and when voting requires data from the social network “Vkontakte”
many people have already fallen for this trick and he is blackmailing him and demands paying him money, and if he doesn’t
threatens to post all photos and videos of an intimate nature and which he received thanks to hacking through the site “
is there any way to somehow block it
punish or something like that
I apologize for the language translated into Google translator
I hope very much for your help

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