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My client had 17,500 links pointing to his site from Yellowpages.com and it caused a algorithm penalty to there local search results.  Here is a sample of the links. Now notice that each link contains a different city. My client city is Tacoma WA. We are positive this destroyed there NAP because they went from first place in the Google 3 Pac to not being the Google 3 pack at all, but for the same keyword they are number 3 in organics. When you go to Bing they still maintain there local search rankings. <a class="sort">Links</a> http://reliance.yellowpages.com/tacoma-wa/mip/phils-auto-care-8439833?lid=1001611723702[image: url_icon.png] http://solarus.yellowpages.com/tacoma-wa/mip/phils-auto-care-8439833?lid=1001612521758[image: url_icon.png] http://www.yellowpages.com/algona-wa/truck-service-repair[image: url_icon.png] http://www.yellowpages.com/arlington-wa/engine-rebuilding-exchange[image: url_icon.png] http://www.yellowpages.com/arlington-wa/mip/integrity-auto-care-480010482[image: url_icon.png] http://www.yellowpages.com/arlington-wa/mission-motors[image: url_icon.png] http://www.yellowpages.com/arlington-wa/semi-truck-repair[image: url_icon.png]

You should check out Prestashop. It has a catalog mode and can be flipped to ecommerce with the click of a button.