I am sorry. I hate it when i have to do this, because i know that it's really silly! But the only reason why i wouldn't Фан anyone back, would be if they had joined the twilight saga club. I can see it on their Профиль and i immediately go all prejudice against them.
I shouldn't, i know, but it's against my morals to Фан someone who loves the Twilight saga. If you're only a Фан of Twilight, sometimes i forgive you... if you've done something to earn my respect.

Which would lead me onto my Далее reason...
If Ты have done nothing to earn my friendship, and not joined any of my favourite/major clubs, then i don't feel obliged to Фан you.
However, if i can see that you're a Фан of 'Random' или 'Harry Potter' или 'HP v T' etc, then the probability is that i will Фан Ты back.

On the other hand, if Ты are looking at this thinking that Ты haven't done any of these things, then feel free to Фан me... i'll gladly return the favour! :)
xxx