This is the reason why you should ONLY use facebook with the https:// – link (https://facebook.com), called “Faceniff”. No more “1337″-hacker skills needed – just root -, this application allows  everyone to log into the facebook-account of someone, who is in the same network. All this, with just a click. It’s true, try it out. You can protect yourself with a VPN network, SSH-tunnels and the easiest method: using the https-link. The application is freely available for everyone on the  “Faceniff” homepage.

Image taken from its official homepage.