In a recently released press statement Commissioner Gordon has this to say:

Edward Nigma (alias the Riddler) escaped from Arkham Asylum some time ago. Though not considered dangerous (due to his fried brain), he was under the illusion that HE is Batman. In an attempt to recreate his glory days of brain washing, he sees the internet as an ideal opportunity and has been posting in many forums, posing as Batman. I believe that all of you are in danger as the person you are all looking up to as Batman is in fact THE RIDDLER!!!!! Please be assured that Gotham City police are tracking this notorious villain down and he will be arrested and re-institutionalised soon. Take care good citizens..

Commissioner Gordon.
You have been warned