Classaction lawsuits (Score 1)

I run http://www.mywebdesktop.net/ and have been advertising quite a lot with google. I month ago I received a letter to participate in classaction lawsuit against yahoo for fraud clicks (even though we have not been advertising a long time with them. However, as we have been using adsense for quite some time, but no invitation to participate in a lawsuit there. A classaction against Google next?