Use strong passwords.
Most of the time when you get “hacked,” you think that it was some super computer genius that figured out a way around your 'secure' password. When in reality, it was usually a simple program that did a "dictionary" attack. This kind of attack simply tries a million passwords in a very short period of time until it gets it right. The simpler your password, the sooner it gets through.
If your password (for Facebook, your email, etc.) is an English word, it can be "hacked" in a matter of seconds with a powerful enough machine.
The only way to protect yourself from this form of attack is simple: use a strong password. A strong passwords consists of a string of random letters, numbers and special characters. The longer and more random it is, the better. For example, the length of time it takes to break the word "privacy" versus the word "pr1vac^" is massive.