^^ Bit of a thread bump.
I've been noticing some oddities with Facebook lately - occasionally someone's profile will show up twice - they look identical except the dates on the timeline, etc. are all out exactly by the same few days and the odd picture is aligned/cropped differently - at first thought they were copied/compromised accounts for spam, etc. but doesn't seem to be the case. Also randomly seeing what look like generic profiles for people I know don't have Facebook - I know FB supposedly created "ghost" profiles for people it tried to guess existed from regularly appearing in photos, etc. but this seems a bit weird - shows up for a few hours when a photo, etc. has been uploaded with them in then disappears again - I'm guessing some bug is going on on the back end.
EDIT: Hmm just maybe figured out from comparing the friends list of one of those - it looks like a "snapshot" of the account as it was a few days back and the number of days the timeline is out by matches about the time elapsed since that "snapshot" was taken if it is some kind of backup routine that has gone amiss. Weird the dates are offset like that though.