From the original article on Search Engine Land: "For a local business, localized search results are lifeblood to them. Focusing on a local SEO strategy can often have a bigger impact on their business model than focusing on the full organic results.
...over the course of the next few months to a year, the geo-social and check-in information will have a large effect on how businesses are ranking in the local space with the migration of places into the Google+ platform".
Full article - A Snapshot Of Local Search Signals: http://searchengineland.com/how-social-signals-could-potentially-influence-local-search-results-125480
Via Antonino Militello, Robin Good