viewtopic.php?f=5&t=43226well known problem, mainly an FB issue, happened when FB updated a year or so ago. They did something with your friend list linking to games/apps. Im sure someone can explain it better. But what it means is the friend list on GL just doesnt work, new ppl are not added to it and ppl who were there before the update will always stay there, even if you unfriend them. I hear the friend list still work fine for some people but for many it doesnt, me included. making trade a lot harder and you cant attack people you were friend with before the update.
so its most likely not a problem on your side but rather an GL-FB problem.