how to hack someones facebook?

[Gunther]

i really need to see the messages on someones facebook acount plese help and with a method that doesnt require like downloads and stuff

[Fred]

You don't. It is totally illegal to hack accounts for ANY reason. The accounts belong to Facebook, not the user and Facebook prosecute. And this question could have earned you up to 20 years in prison. You just publicly incited others to conspire to hack accounts n a site monitored by every Internet authority, which stores all your details for years, and has close ties to Facebook. And where most of us spend our lives trying to put away criminals like you to protect our customers.