Marking Facebook Territory

After friends have a nasty fall out or a BF/GF break up and they race to comment or like a mutual friend's pictures/posts on facebook before each other in an effort to 'claim' the mutual friend and have them on their side of the break up/fall out.

Fuck, my bitch ex was Marking Facebook Territory on Sarah's profile picture before I could like the picture, now I can't comment or like Sarah's picture!