Being defined by what you are not is not such a terrible thing, unless of course you are not able to read this, in which case life has probably forced you to purloin this computer, which you should return immediately to its proper owner. Why are you just standing there staring? Now, meet a social network defined by not being particularly social: Buddify.
Founded by two UK men ("that weird guy that commented on your profile when you first signed up" and "the Scottish guy that pays the bills"), Buddify's a no-frills site that intends to fulfill only the essential purpose of a social network -- connecting groups of friends, posting lots of pictures -- while at the same time ensuring users aren't barraged with requests to befriend deodorant companies, or worse, people. The latter's accomplished through a tier of one-click privacy features, starting with the ability to instantly hide your entire Buddify existence: profile, photos, groups, friendships, and any comments you've ever made, all the way up to "the greatest trick the Devil ever pulled was convincing the internet he didn't exist". Less drastic moves include the ability to choose who can see each aspect of your profile (everyone, friends of friends, friends, just you), and whether or not it shows up in public searches; you can also selectively block people/groups from seeing any bits of your info, and disable friend requests altogether once you decide you've got enough of them -- thereby sparing yourself from strangers simply trying to up their numbers, and people who want to have sex with you based on your profile pic poloneck alone.
Buddify doesn't offer much in the way of apps, as their streamlined approach doesn't allow for countless games designed to be played against people you've never met -- time you could spend LEARNING TO READ. That really didn't help, did it?