One who intentionally stands in the background of other peoples' photos just to ruin the picture. This person will sneak into a picture without anyone knowing until the photo is later looked at. This person will stop at nothing to be in as many photos as possible.
V. Picture Vulching- the act of being a picture vulture.
Girl: "Let's look at the pictures from your birthday at the bar!"
Other Girl: "Who's the random guy in the background? He's such a picture vulture!"