When one comments on another's facebook status and suddenly leaves the conversation like they weren't even there.
Dude! Did you just see that? Shannon just faceditched Jennifer's status!
When you and a friend are on Facebook, having an intense conversation, whether it be wall-to-wall, or inbox, and all of a sudden that person logs off without informing you, meanwhile you wait around for a notification telling you of their latest post.
Person 1: Whoa, you totally FaceDitched me earlier when I was telling you about that slut in our grade!
Person 2: O-M-G, SORRY, I had to go and didn't have a spare 2 seconds to post you telling you I was leaving.