Any way of reporting Private Servers?

I don't want to get into the legalities of the private server debate - let's just say that I pay a couple of £9 a month subscriptions to support game development and I don't think it's right for people to freeload off the back of Blizzard's work.

Recently I've started to get spammed up by people offering private server access. It's happened a couple of times in-game but it's also happening a lot on Twitter and elsewhere. Normally I'd just ignore it and trash it, but some of them are getting a bit pushy about their products.

These aren't people running a private server for fun either. They're running it as a business, which to me crosses a line.

Trouble is, I can't find out how to report this stuff and give Blizzard a heads-up on it. In-game I've got the report spam option, but that doesn't cut it for places like Twitter and elsewhere. Does Blizzard have a method for us to report this kind of stuff, or if not how would you like us to do it?

Thanks in advance, hoping I get a response before this thread descends into anarchy and chaos :)