After the spread across the Internet of several youtube videos and announcements by “Anonymous” on taking Facebook down, and then denying any “official” involvement in the announcement of the attack on November 5, Kaspersky Lab’s specialists highly rate the degree of protection of Facebook infrastructure against cyberattacks. The IT security team at Facebook proactively creates measures to protect users’ accounts and also the system itself.
Therefore, it's most unlikely that the Facebook infrastructure will be affected by cyberattacks; however, hackers may still be able to get into some user accounts by breaking their passwords.
To protect an account on Facebook, it is recommended to follow sound security practices, such as:
Having a unique, complex password for every single online account;
Activating secure browsing (HTTPS) in Account Settings;
Enabling login notifications in Account Settings;
Enabling login approvals in Account Settings;
Making sure the operating system is up to date, including all third party software such as MS Office and Adobe Reader;
Using a modern, secure browser such as Google Chrome;
On Windows, if not done already, considering upgrading to Windows 7 64 bits;
Running a security suite such as Kaspersky Internet Security 2012;