A secure democratic Net is a fundamental right

They mostly come with links in your forum or other interactive functions. I am sure that you don't really need those functions in most of the cases and that they are filled with spam, porn and bullshit. The few people that will have left a message could have sent you an email anyway and you could have republished those.

In Google you type    site:mijnsite.be of com of .....  followed by steroids, pharmacy, sex, porn or whatever

and than you can decide to just close it down or clean it up and keep it clean

there are hundreds of sites in the .be domain that are infected with foruminfecting spamlinks of all kinds - even big sites and governmental sites.