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If you're reading this post looking for reasons why your Google Adsense ad serving has been limited, I don't have any answers for you. I do have theories, my own story, which you might like to read, and an alternate provider to get you back up and running. All of this happened to me in quick succession, so I can say for certain that if you're getting a notification about Adsense invalid traffic concerns, there is hope to get that revenue stream going again and you can even get customer service to go with it. (read more)
AD SERVING HAS BEEN LIMITED ADSENSE