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My questions are: Is this a normal level of invalid clicks? What could be causing them? And should I be concerned?
A few invalid clicks a week? You must be kidding.
I'm sure a lot of people here get a few invalid clicks each hour.
Is that so? Then that's encouraging. The main time we hear about invalid clicks is when someone gets banned for them, so I don't have any other means of comparison.
Just curious as to how you know they are invalid?
My site gets few enough clicks across narrow enough channels that $0.00 clicks are often obvious from looking at the channel stats.
just curious: how you determine invalid clicks by channel reports?
If there's only one click and $0.00 in a channel at the end of the day, then the click was probably invalid.
Slightly dodgier method: If there's, say, 3 clicks in a channel and $2.00 at the beginning of the day, and stats update regularly, then at the end of the day, if there are 4 clicks in that channel but the money hasn't gone up, there's a chance that the fourth click was worth $0.00 and thus invalid.
Could be charity ads for a small part of your traffic.
Good point. They do pop up here and there when Google's algorithm burps.