I saw an ad yesterday and I was shocked. Not because of receiving an ad, but because the first ad I received was to a well known scam. You know, one of those messages like "You were the 1000th people to visit our site. Click here to win 500€ for free."
"- Yeah, right. I'll click it right away... but please wait in a comfortable position."
That is sad, really sad. Imagine those users who don't know much English and would do anything for a couple of cents.