Facebook hacking is a word describing how hackers secretly find a way of looking at and/or changing information on someone’s Facebook account.
Despite the security measures taken by Facebook Inc to ensure users privacy is secured, but yet you get complains of that an account is hacked.

The truth is, as a Facebook user, you have an important role to play to protect Facebook account and prevent it from being hacked.

This article explain in details the techniques hackers use to hack your account and how to avoid being a victim.
You can read the complete article here