[celtain]

This kind of content came with the internet, not social networks. Traditional forum moderators have had to deal with really vile content for a long time now, along with the operators of almost any other media sharing website.

Unless you want to make it illegal for individuals to widely share content without going through an editor, this kind of problem isn't going away any time soon.

[jessaustin]

It really depends on how any particular site functions. Some sites function better than others. For example, "this kind of problem" doesn't seem to plague us here on HN.