Facebook reported this past week that 50-90 million accounts where hacked or compromised through three bugs in their interface that would allow some hacker to bypass challenges via a stolen access token, video downloaded access. Facebook stated they have fixed the bug and made stolen access tokens unusable for the 90 million compromised accounts. So if you had to re-log in this week, chances are, your account was compromised. Add that point, it would be smart to change your password. On top of that, it may also be a good idea to turn on the 2 Factor Authentication in your Facebook settings.