Customer reviews on third party websites such as Yahoo Directory, Yelp.com…etc, has positive impact on Google Maps ranking.
In addition, each niche has each authority site. For instance, if you run a construction business, servicemagic.com’s customer reviews are very important to your Google Maps SEO.
For other local search, visit our Google Maps Algorithm page, Google Maps Optimization (Google Maps SEO) page, Live Search Map and Yahoo Local page.


[...] Customer reviews on third party websites [...]