During my teenage years, the most popular social media site is "Friendster". Before I accept a friend request I take a look first clearly at the photos and see if the person is real not just a dummy account which tends to scam people. If the person seems real and has a good looking I do accept the friend request and don't care wherever she's come from. As long as the girl is beautiful I normally accept.
These days that Facebook is the most popular. Users of Facebook is a lot more compare to other social media sites, and friend request are really flooding. Since I'm no longer single and already have three kids, I no longer have interest in communicating to other people especially for those who's I really don't know. So I only accept friend request for those who I really know and those who's I can say real friends. My Facebook account can tell, coz I only have 100+ friends on my list. All of them are my real friends which has the characteristics that is worth to have.