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This is a huge problem. There is no "pay per click" Company denying that click fraud exists. Web analytics companies estimate that 50% of all click activity is fraudulent.

This means that your pay per click marketing activities are half effective as they could be because of click fraud.

Overture spokeswoman Jennifer Stephens refutes that in estimate, numbers likely represent acts of fraud that are ultimately caught. She added that Overture filters most fraudulent clicks with best antifraud system in industry, which combines technology and human analysis.

Most advertisers are aware of click-fraud issue but have not delved into it because of technical complexities involved. Others are concerned that they could jeopardize their relationships with powerful search networks if they complain too loudly.

One of best ways to eliminate click fraud is using anti click fraud services such as ppctrax. They provide services like below:

IP address capture. IP address geographic Location. User Agent (browser, bot etc.) See exactly what keywords are generating your clicks Date and Time stamp System detects sudden click spikes from one or more IP addresses Real-time email alerts at 80% and 100% of your account's transaction utilization IP address history - alert you to prior offenders

Another similar service is "who is clicking who". Other way is click fraud capture software like Click Auditor.