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1.
n. a phenomenon that has cropped up recently due to the prevalence of social networking sites including, but not limited to, Facebook. The Ghost of Facebook Past is the collection of all the remnants of your past self that show in your Facebook profile, whether it be music you've since moved on from, shows you used to like but now hate, people you used to know, anything like that.

Results from the nature of people to move in and out of interests in a fluid manner, while the information on Facebook and other sites will not change unless you alter it.
Joe: Uh, Chad, your Facebook page says you like Power Rangers.

Chad: Nah, not since junior high. It's just the Ghost of Facebook Past.
by Stan the Woz December 04, 2011