BTW You could sue the snitch website for libel charges if what they are claiming is false: For example if they post a picture of a hooker getting in your car and THEN they write WITH IT that she was a prostitute who was in the process of performing a sexual act for money, you may have a case. But the website has to prove this which is very difficult and if they cant then you have grounds to sue them for libel since what they wrote is "untrue".
But I repeat, it is NOT illegal to post license plates, pictures, videos etc. on the web as long as these are not breaking any criminal laws.