How do people hack facebook accounts?!?

How do people hack facebook accounts?!?
Hi,
so my facebook account was recently hacked and i am wondering how people do it!
I'm pretty sure it's not my fault because i have different passwords for everything online, i never share my passwords with anyone, no-one has ever seen me put in my password, i change them every month and my secret Q & A are things that only i know.

How do people do it?



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