I totally don't use it to follow attractive models or anything like that, of courseThe only one you mentioned in the poll that I don't use is Instagram. I don't see the point in a social media site for only photos. There's no logic in that for me. A lot of people use it though and it is very popular.
Anyways I mainly use youtube and I watch certain people stream on twitch once in a while. I'm not a fan of facebook but I intend to make social medias for Mind Piff and add the links in the header soon. Just haven't done it quite yet.