I'm an entrepreneur and my friends and I have started up a business and website to go with it. Problem is, we're receiving nasty (very nasty) comments in our drop box and I know who it is despite it being anonymous. Its one of my old friends from school and I wasn't the kindest to him but he's took it upon himself to literally spend 2 full years dropping these nasty comments on our website.

We've tracked the IP address on these anonymous comments and was able to narrow it down to where he's currently living right now. How can I use this information to my upper hand ? He's said stuff that are just too graphic to mention on reddit and I don't want to get banned from the sub. Thanks