FindClone application. Upload an image, and it looks for a similar person in the social network. If I'm not mistaken Vkontakte. It has a trial period, a limited number of searches, and for a certain period
As he himself said in the video "HARD SOLDIER | PRUNK IN CHATROLETTE", he is the moderator of the chatroulette. But I just want to warn you that this information may be unreliable
I can only guess The simplest thing is to do a search in Yandex and Google, there is a search by pictures. You upload a photo and the search engine gives out a similar one - probably a page on a social network. There is also https://www.tineye.com. Judging by the dataset - date of birth - he finds a page on the social network and takes data from there.