Read the earlier article i posted about this. It is not a Facebook issue but the ease of which browsers can be comprised.
Facebook explained in a statement that the spam attack was the result of a browser vulnerability that tricked users into running malicious script and sharing the content on their own profiles.
The images on the site are so disturbing that some users say they are threatening to leave the site. Users have reported seeing images of dead animals and altered images of celebrities in explicit situations.
“I am so close to just deactivating my facebook account because of these hackers,” wrote one Twitter user, just one of many who have threatened to leave the network because of the attacks.
via Facebook confirms investigation of graphic images – The Washington Post.