The answer is, it's not up to us, we're not trained or qualified to answer any questions of legality and if we were to give you guidance on this topic we'd likely be causing yourself and ourselves more harm than if we didn't.
If you believe that someone is guilty of a crime such as Defamation of Character against yourself then please seek legal advice from your solicitor and have them contact us. Once their credentials have been validated, we will provide every assistance to them to aid their case.
The same applies to any site on the Internet, the fact that a diary on here could be having a go at you is no different to a diary on one of the other diary sites (or even a normal webspace host) that might have a go at you.
I say again, we will not and can not advise on legal issues as we are not qualified to do so.
If any solicitors dealing with cases of this nature would like to make themselves known to us we would be happy to pass on any contact information to any users that ask.
Matt.