All this flurry over frienditto put me into research mode. From what the site seems to indicate, it’s a way to archive your LJ–although there are much better archiving tools available. Apparently it’s also a sneaky way to make public to the world the locked posts of people on your friends list. Read the informative post zannechaos made about it if you are unfamiliar with what I’m talking about. And as a helpful community service, arkady has created ditto_cop to track archived LJs on Frienditto.
Moral of the story: Friends do not let friendsditto.