Forum Moderators: martinibuster
For example, if you had a 1% CTR steady for months with a steady amount of page impressions, and all the sudden it went up to 15%, you should be concerned.
Depending upon your traffic, the ad targeting and any filters you may have in place -- these things happen.
If the higher clickthrough rates prevail over a longer period of time, I would send Google an email and ask them to look into it. If you're sure they're legit -- no worries, and they'll at least know you were concerned about the integrity of the program.