Now, most affiliate programs have strict terms and conditions on how to generate leads. There are also certain banned methods, such as installing adware or spyware that redirect all search queries for a product to an affiliate's page. Some affiliate marketing programs go as far as to lay out how a product or service is to be discussed in the content before an affiliate link can be validated.

The Internet has increased the prominence of affiliate marketing. Amazon popularized the practice by creating an affiliate marketing program whereby websites and bloggers put links to the Amazon page for a reviewed or discussed product to receive advertising fees when a purchase is made. In this sense, affiliate marketing is essentially a pay for performance marketing program where the act of selling is outsourced across a vast network.

Websites consisting mostly of affiliate links have previously held a negative reputation for underdelivering quality content. In 2005 there were active changes made by Google, where certain websites were labeled as "thin affiliates".[34] Such websites were either removed from Google's index or were relocated within the results page (i.e., moved from the top-most results to a lower position). To avoid this categorization, affiliate marketer webmasters must create quality content on their websites that distinguishes their work from the work of spammers or banner farms, which only contain links leading to merchant sites.

Use variety. Mix and match affiliate ads so you don't overwhelm your visitors (content-embedded affiliate links usually have the best click-through rates over image links.) Consider using a lead page and funnel system to market your affiliate business. Lure prospects to your email list with a free offer and include links to your affiliate product pages.

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.[33]
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