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.
