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"...Even the Internet giants are warming to the idea of harnessing informal chats between friends to promote their products and services. This month, Amazon.com said it would start paying commissions to individuals who refer buyers to the site via Twitter messages. (People must first sign up for Amazon Associates, a program in which Amazon pays Web publishers for referrals to its site.)"

"...But the bigger opportunity may be in matching advertisers with so-called influencers — the more popular users of services like Twitter. A number of start-ups, like Ad.ly, Izea and Peer2, a division of Creative Asylum, a Hollywood ad agency, are pursuing the opportunity to put persuasive messages into regular dialogue on social networks."

http://www.nytimes.com/2009/11/22/business/22ping.html

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