I am Getting Alets When My Friends Changed Address Or Phone number..What abou u

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Hi.. I Come Across A Newbe www.addressinformer.com which alets you when ever your friends changes name or even phone number.It is UseFul When Friends moved to different states in a country Or even different Countries.Single Update Alerts the Whole Friend circle. I want To know some More Wbsites With This Concept .Plese suggest me.