What do mormons believe about lucifer?

Okay, so a friend of mine told me this really outrageous story only he believes it's true. should I believe him or is he just...

To the FunAdvice members how long did you believe in Santa Claus?? Until what age...?

Read about it: http://healing.about.com/cs/energyhealing/a/aa_vampires.htm

do you guys believe the saying "those who arnt afraid to die never truly die"? or something like that

do you believe that when someone says that a promise is a promise that you actually have to do what you promised on or what ?

theres a woman for every man (I believe thats how it goes, its something like that...anyways do you believe it??)

I want to now what a range of user believe in or have seen tell me your stroy or just answer yes or no : ]

I'm partly salvadorean and it irritates me that mostly everyone I knw believes that we are the same thing.

well it is a kinda stupid game lol but I am bored so here is what you have to do... and I want to know what you people believ...

Anyone else here who believe in things like zombies werewolves, vampire, lizardman ect. ect.? Yeah i might sound crazy by th...