
More recently a lot of the innovation seems to be around looking for ways to lend authority to entities rather than content – entities can be people or businesses (often small businesses).
On the small business side reviews and recommendations are the most obvious way to extend the ebay concept to entities like restaurants, clubs, bars and other local businesses, and for the last couple of years a number of companies have been doing that with varying degrees of success – e.g. Yelp and Qype.
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