Mobile advertising is an unavoidable part of the Android experience - in fact, some would make the case that it's the whole reason for Android coming to exist in its current form. But that doesn't meant that it can't be improved. So Google's AdMob team has been looking at ways of making delivered ads both less intrusive and more functional, namely by cutting down on unwanted activations.
According to the post on Google's Mobile Ads Blog, accidental and non-intentional taps on the ad space are one of the biggest problems they've had to deal with. It's claimed that even the advertiser isn't too keen on accidental visits, since they're using up server resources on a customer who isn't necessarily all that valuable.