When a person writes two or more consecutive comments on facebook, using the subsequent comments to add more detailed information, usually to prevent themselves from appearing ignorant or idiotic to others who may question the legitimacy of the original comment.
Joe's Status: Feel so drowsy today.
Mark's First Comment: Don't you mean, DRAW-SAY :p LOL!
Mark's Second Comment: You had to be there to get that.
Mark's Third Comment: At the party, I mean.
Mark's Fourth Comment: Joe got totally pissed whilst we were playing charades.
Joe's First Comment: Way to go with the back-up comments...douche