writes "So we've come to accept that Facebook knows a lot about us and our friends, and uses that to target ads. But how about them lying about what we do or like and mispresenting our behavior? Every now and then these friend finder ads show up, in which it is claimed that this and that friend already used friend finder. I've checked my mentioned friends, and none of them actually used it. If Facebook is lying about this, why wouldn't it be lying about other user behavior? Any other bad experiences like this? Or any suggestion on how to make them stop?"