Some security researchers had suspected that Anonymous might have been behind the Facebook spam. But the pornographic image spam didn’t fit the Anonymous modus operandi, and furthermore the outbreak didn’t even appear to be new. An analyst at BitDefender had said Friday that Anonymous has been preparing a hit on Facebook, using malware that it had developed and released in July. A previous Anonymous attack campaign, “Operation Facebook,” was quickly dismissed as a hoax by many Anonymous members. Security researchers are still watching Facebook carefully for signs of Anonymous-led attacks.”]
Source: https://www.darkreading.com/attacks-breaches/facebook-porn-spam-appears-unrelated-to-anonymous