V- The action in which one purposefully puts themselves down on a major networking site to gain adverse reactions from their peers.
Person A(types): I am so fat, I can hardly fit myself in my new prom dress.... :'-(
Person B(types as a comment): Aww no, you are sooo thin and beautiful!!!
Person C(types as a comment): No, you're fatter than Santa Claus on the day after Christmas. Now stop vainbooking.
The act of posting status on Facebook and constantly refreshing your profile to see how many people comment on it.
"Did you see Joe yesterday? He was vainbooking again. That guy is so full of himself."