I have the same problem sometimes. I run a small wiki and wikis are pretty popular with spammers since there are lots of abandoned wikis at well-ranking domains

I have the same problem sometimes. I run a small wiki and wikis are pretty popular with spammers since there are lots of abandoned wikis at well-ranking domains that can easily be spammed. I followed the links and they obviously didn't care much for their privacy either. Using a combination of Whois and some private information database I could easily figure out the people behind it, including lots of their private information, pictures of them and their family members, etc. But now what? They are operating from the United Kingdom and Poland and I have no idea how to proceed. Anybody who does this (chasing spammers) more often know what to do after you have all their private information?