¿Qué pensarías si te digo que la generación de leads comenzó hace 6,000 años en Mesopotamia?. Increíble ¿No? Pues durante ese tiempo la tribu Mesopotamica inventó una forma de intercambiar bienes y servicios mediante el intercambio de té, especias, alimentos, armas e incluso cráneos humanos. Esto se denominó más tarde sistema de trueque. El dinero no existía entonces. Pero incluso después de que nació el dinero, el sistema de trueque no murió.
An e-commerce merchant wanting to reach a wider base of Internet users and shoppers may hire an affiliate. An affiliate could be the owner of multiple websites or email marketing lists; the more websites or email lists that an affiliate has, the wider his network. The hired affiliate then communicates and promotes the products offered on the e-commerce platform to his network. The affiliate does this by implementing banner ads, text ads, or links on its multiple owned websites or via email to its clientele. Firms use advertisements in the form of articles, videos, and images to draw an audience’s attention to a service or product.

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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