Beneath its slick interface and crystal clear GPS-enabled vision of the world, Google Maps roils with local rivalries, score-settling, and deception. Maps are dotted with thousands of spam business listings for nonexistent locksmiths and plumbers. Legitimate businesses sometimes see their listings hijacked by competitors or cloned into a duplicate with a different phone number or website. In January, someone bulk-modified the Google Maps presence of thousands of hotels around the country, changing the website URLs to a commercial third-party booking site (which siphons off the commissions).

Small businesses are the usual targets. In a typical case in 2010, Buffalo-based Barbara Oliver & Co Jewelry saw its Google Maps listing changed to “permanently closed” at the exact same time that it was flooded with fake and highly unfavorable customer reviews.

“We narrowed it down as to who it was. It was another jeweler who had tampered with it,” says Barbara Oliver, the owner. “The bottom line was the jeweler put five-star reviews on his Google reviews, and he slammed me and three other local jewelers, all within a couple of days.”