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 fã anyone back, would be if they had joined the twilight saga club. I can see it on their perfil and i immediately go all prejudice against them.
I shouldn't, i know, but it's against my morals to fã someone who loves the Twilight saga. If you're only a fã of Twilight, sometimes i forgive you... if you've done something to earn my respect.

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

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