http://www.spiegel.de/netzwelt/netzp...827344,00.html
What did they do?
They advertised on kino.to, a huge piracy website that was closed last year. 5 people who ran kino.to are already sentenced, some of them will do up to almost 4 years in jail.
The main owner is still waiting for his trial and now they're going after their advertisers.
and btw - most content on kino.to was hosted at Megaupload
So when does it start to become dangerous for those who advertise on international piracy sites like pirate bay (DoubleClick Ads) etc...?