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In addition, a well-designed PPC advertising campaign allows an advertiser to save a substantial amount of money as the value of each visit (click) from a potential customer exceeds the cost of the click paid to a publisher. For publishers, the pay-per-click model provides a primary revenue stream. Think about Google and Facebook, which provide free services to their customers (free web searches and social networking). Online companies are able to monetize their free products using online advertising, particularly the PPC model.
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