We always hear that Google has a sophisticated system to detect the invalid clicks, and result in termination of the cheaters' account. But, how can Google do that? In this post, I summarize those ways that Google depends on to detect whether the clicks on your site are invalid or not. Google will not first ban your account immediately. Rather, they will first flag your account and Google will keep a closer eye to your account. In some occasion, they may send you a warning letter to notify your situation; but sometimes not.
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