I have encountered 3 occassions with adsense firefox plugin showing that the number of clicks jump from 1 to 15,2 to 10,1 to 8 in just a mere 15 min interval without any increase in revenue. I doubt those are valid clicks. Anyone here experiences the same thing?
Yes, sometimes all the stats don't update at the same time and sometimes you don't get credit for clicks that have been determined to be invalid.
Yep, the stats can updtae at intervals. Its not real-time, so you won't find clicks updating as they happen.