Spam is the biggest threat to organic search engines, whose goal is to provide quality search results for keywords or phrases entered by their users. Google's PageRank algorithm update ("BigDaddy") in February 2006—the final stage of Google's major update ("Jagger") that began in mid-summer 2005—specifically targeted spamdexing with great success. This update thus enabled Google to remove a large amount of mostly computer-generated duplicate content from its index.[29]
Jump up ^ Shashank SHEKHAR (2009-06-29). "Online Marketing System: Affiliate marketing". Feed Money.com. Archived from the original on 2011-05-15. Retrieved 2011-04-20. During November 1994, CDNOW released its BuyWeb program. With this program CDNOW was the first non-adult website to launch the concept of an affiliate or associate program with its idea of click-through purchasing.

Affiliate marketing is also called "performance marketing", in reference to how sales employees are typically being compensated. Such employees are typically paid a commission for each sale they close, and sometimes are paid performance incentives for exceeding objectives.[21] Affiliates are not employed by the advertiser whose products or services they promote, but the compensation models applied to affiliate marketing are very similar to the ones used for people in the advertisers' internal sales department.
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