Sudden appearance of Offensive images in facebook news feed

A well coordinated attack, which started a few days ago, has now become a huge issue for millions of facebook users. You may already have noticed sudden appearance of offensive images in news feed containing pornography and voilence.
These appearences are because of the attack which is carried out through a self-XSS exploit inside browsers. Thousands of users have already been affected, countless others worried, disgusted and some have even started avoiding visits to their account.

Engineers at facebook are working to get this fixed. They're also going to banish malicious accounts and pages.

“We’ve put in place backend measures to reduce the rate of these attacks and will continue to iterate on our defenses to find new ways to protect people,” a Facebook spokesman said.

Meanwhile user's are advised not to click on any unknown external links no matter how luring they are. Also avoid executing javascripts in address bar.