Step 1: secure your account.
Choose a password that is the same strength as one you would choose for online banking (but don’t use the same password). Having a strong password will help prevent someone from hacking into your account.
Step 2: take precautions with where you access your account.
If using a mobile phone, free network, or an unsecured network, or public computer (at a library, in school, even at work) it may not be worth updating your status for the sake of your privacy.
Step 3: read the privacy terms and agreements of any applications you might download through Facebook.
Third party applications do not have to abide by the same rules and it is wise to ensure you know what you are agreeing to before allowing them access to your data.