   It wouldn't fit anyway, an external link should provide more information about the subject of an article - so an article in The Economist that discussed (for example), the marketing strategy of amazon when releasing the kindle in some detail would be fine, an article telling people how to market their books for the kindle would not. That link provides no useful information about the Kindle, it's position in the market, it's history, it's future. It offers a service for Kindle users and that's the sort of link we use.   