The threat of legal action might have some sway with any websites of note, being the business is being libelled and they are facilitating that libel
Fair criticism is one thing, but depending on the content of his pissy moanings on industry specific websites statements designed to maliciously harm the business are a different matter.
If you ignore him he'll get bored and wait for his next online crusade, just contact site mods for deletion of his comments.
( Light In Chains maker of the ikea sofa, Tue 31 Jul 2012, 10:37, 1 reply, 13 years ago)

*nods*
Ta
( Monty Boyce, My cheese game is strong, Tue 31 Jul 2012, 10:38, Reply)

Can't you report it to the police and give them all the information you have?
That way it's up to them to investigate.
(PsychoChomp, Tue 31 Jul 2012, 10:46, Reply)