If there are random pictures of their kids in the background of some photo posted to Facebook, how are they not anonymous anymore? I'm reminded of the scene fr

If there are random pictures of their kids in the background of some photo posted to Facebook, how are they not anonymous anymore? I'm reminded of the scene from Jurassic park, where nedry is chastised for using a man's name during a clandestine meeting at a restaurant, and nedry yells out "Dodgson! We got Dodgson here! See, nobody cares!"