• As mobile marketing gains popularity, so do concerns around it and a Trademob report shows that 40% of mobile ad clicks are fraudulent or accidental.
• After looking at six million clicks, it was determined that only 60% showed legitimate interest in the advertisement.
• In the study, of the useless 40%, 55% were accidental, but 45% were fraudulent.

From the article:

Mobile advertising may still be in its infancy, but if a new study by Trademob is correct, click fraud on mobile ads is already quite well developed. The mobile app marketing company conducted research that showed that 40% of mobile ad clicks are either accidental or fraudulent...