Click-Fraud Usually Detected, Google Says

Google disclosed data showing that while its pay-per-click Web advertising system is under regular attack from fraudsters, virtually all such tricks are automatically detected, rebuffing critics who say its online ads are a magnet for fraud. Click fraud can occur when Web site publishers attempt to trick Google's ad system into counting ads never seen by real users, or when competitors use automated programs to create fake clicks, driving up charges per click and rivals' ad rates.

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