Zynga is the developer of the popular games in Facebook (Cafe World, Mafia Wars, Petville, Fishville, FarmVille, Zynga poker and YoVille to name a few). And it seems that they and their forum users are the target of bad guys via this phishing email reported by Vitalsecurity.org
Here is a sample image of the phishing mail
If you receive such phishing mail, just ignore and delete ok?
Stay safe online!!!