Your customers aren't looking for you in the phone book, they are using their phones. But, in order to be found, you have to be listed.
In one day an average of 900 million Google searches are for local information.
At a minimum, your business should be listed with Google and Bing places. But, to get the best exposure, you should also list with business directories and social sites like Facebook and Foursquare.
For more tips on getting more exposure, see this article: http://freelance-web-designer-developer.com/the-new-phone-book/
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