some kind of indication on those user Tooltips(the small boxes of information that appear when you put your mouse over someone's image) if you have that person friend and/or fanned and/or rated. Like a little person under their picture for friend, a little icon, like a fan for fanned and a cherry for rated. So, something like this:
and then when you go to someones pictures, some kind indicator that by photos that you have rated. I've gone to photos thinking that I've rated time but I haven't, I've also gone to photos thinking that I haven't rated them, but I have. maybe a cherry by the rating in the gallery.
so something like this: