Recently a number of people found malicious and offensive posts on their profiles and pages. Unfortunately these posts were not from the persons indicated. Some form of hacking had taken place.
An excellent article was written in March on PCMag.com on two apps that can protect your Facebook account.
One app, Norton Safe Web for Facebook is bundled with the Norton products, but anybody can use it for free. It scans your Facebook page's links and reports any bad ones.
If you're concerned about dangerous links (and you should be), there is also another app recommended and more info in this article at PCMAG.com .
Happy and safe networking