My scheme du jour is to remove myself from my own friends list. Add them as a friend, but make a friends filter called "pests". Then Proceed to to 3000 character nonsense posts, or post huge images. But post them so only people on the "pests" list can see it. Assuming they actually read the journals of all their "friends" they will be annoyed by how your posts take up a lot of space, flood their net connection, and muck up their page formatting.
Or you can just ignore them. Yep, I think that is the easier route.