how did a friend on my facebook hack me so quickly?

[Ben]

He didn't "hack you in 5 minutes". He already had your password.

Most "hacks" are actually just social engineering tricks- they don't steal your password from Facebook (who doesn't store your password anyway- they store the result of a one-way mathematical function performed on your password that takes way more than 5 minutes to reverse even if he did have access to Facebook's servers). Instead, they either guess your password from information you've already given them or they trick you into giving them your password, often without even knowing it. It's also possible he managed to get a keylogger installed on your computer, which told him what you were typing. All that's needed for that to happen is for you to run a program he sent you (which could be disguised as something else) or for him to have physical access to your computer for a few seconds.