I think before rushing the newest fad it would be wise to do intense research into what problems NoSQL database solve and whether it is worth the investment. The problems Amazon and Facebook and Twitter have are unlikely to be the same as the typical add-edit record applications.

This video http://www.xtranormal.com/watch/6995033/ has some excellent discussion 

On Fri, Nov 26, 2010 at 12:41 PM, Dennis Kioko <dmbuvi@gmail.com> wrote:
Foursquare use MongoDB
Facebook have their own NO-SQL DB same as Google

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