I had 2 yesterday. Instinctively closed them w/o reading what they were for. Can't be anymore help, but I will keep my eye out next time.
How does that work if an ad server is "breaking the rules". Do you guys have contracts w/ them? Are there penalties for playing outside the parameters? I'm genuinely curious as to how the whole thing works.
IME, ad companies are notorious about breaking their terms. The often inject their own code alongside their ad banners, etc that snoops for keywords and brings pop-ups. I never got penalties out of it, but I never had the traffic of SF. Depending on the severity I either terminated immediately or warned them once and then terminated.