The act of writing or posting suggestive comments on someone's Myspace or Facebook Wall to let other people know that you are currently involved with or hooking up with this person. Also the act of tagging photos of the two of you so that other potential suitors see this and will lay off.
"I'm going to tag these photos of Joe and I from this last weekend on his facebook so that other girls will get the point that he is taken." "You are so into the social network cockblocking."
by MileHighBunny December 05, 2008