How to secure your Facebook
Here's a quick way to enable secure browsing on Facebook. If you don't already do this, now is the time! Secure Browsing (https) is an opt-in security feature. When you turn this feature on, your activity on Facebook becomes encrypted, making it harder for anyone else to access your Facebook information without your permission.
To turn on Secure Browsing (https), navigate to your Account Settings page. Click the "Change" link next to Account Security, check the box under "Secure Browsing (https)" and then click the "Save" button.
You will also see an option to receive emails when a new device accesses your Facebook account. These notifications are called Login Notifications.
When you turn on secure browsing, any other active Facebook web sessions will be terminated. This means that if you are logged into Facebook on another web browser, you will have to re-enter your login information.
Also remember that if you're trying to view third party applications (like Zynga Poker) you might get a message saying you need to switch to regular http mode. You will see this error message because the third party app you are trying to access does not support secure browsing (https). If you would like to use this app, simply click "continue." Facebook will temporary turn off secure browsing (https) while you use the app and automatically turn it back on for you when you are done.
Do you want to know more about secure browsing? Visit the Facebook help page.