How to get profile id in VK, facebook, ok?

Question

JavaScript

Good afternoon! I have noticed this situation more than once: you go to some site, spend some time there, go out and after a while the manager from this site writes to you on VKontakte, offers help, because. I visited their site. Is it possible to covertly pull up social network profiles, perhaps there are ready-made solutions or services?

Answer 1

I read somewhere that on such sites, the top invisible layer is the social like button. networks, or something similar, well, it turns out that when you click on any area on the network, it shows who liked