So I've identified a key demographic that's excluded from social networks, by their very definition.

Misanthropes.

Misanthropic individuals need their own little area of the internet too.

I propose "MySpaceNowFuckOff.com" although this would probably result in a protracted legal battle. I'm open to name changes.

It would be a site for socialising with others like you, who don't actually want to socialize, where you don't get "likes" you get "disinterested acknowledgement", there isn't a share button but a "shame this idiot" button. And you don't have friends but a list of "people who haven't pissed me off... yet".