| http://www.w3.org/ns/prov#value | - Leitch notes that a bad sales day in pay-per-click campaigns has many possible causes other than click fraud, and that there are legitimate reasons why clicks can escalate very quickly without producing sales. ???If you???re involved in contextual targeting, for example, and there is an event such as the London bombings and you???re bidding on keywords surrounding London, your clicks could go thro
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