Between the identity theft and the smut lists, there's plenty of bad trolling going on in Facebook. But here's a rather subtle, and mostly benign, way to get under your friend's skin: artists Oli Beale and Alex Holder like to tweak their friend's Facebook pictures ever-so-slightly, to tip them over into the creepy side.
On their site, they write, "I like going onto my friend's Facebook page, taking photos of him, changing them slightly, then putting them back up on Facebook. He doesn't like me doing this." You can see more of their photo tweaks on their site. The friend, James, sounds increasingly stressed by his friends shenanigans, threatening at one point to take a computer course to learn how to get revenge. Has he considered turning them into a meme?