Thats a shit situation mate
I also find it funny that people that you either hated, never spoke to, or hated you seem to add you now that thats in the past. Fuck that, I always reject those mofos straight away.
No doubt its a source of pain though, particularly where pictures are concerned i find. A picture can tell a thousand words, and therefore a thousand lies!!! Your bird/wife whatever see's a picture, doesn't know the story behind it, bang, you're neck deep in the shit!
HOWEVER, on the flip side, it has allowed me to get in touch with people that, for whatever reason, i lost contact with and would actually like to catch up with and see again, which is the main point of it.