It is important for everyone to keep up to date on security matters to keep your online accounts secure. Here is a video by Facebook Security team to keep your account and information secure on Facebook.
Facebook offers its users to enable https to their accounts to protect from secutiry threats like viruses, malwares and hackers. To enable Secure connection go to "Account Security" section of the "Account Settings" page from your account, there you find the option to setup secure browsing.