AvatarlostinfranceFoursquare revamps its developer site as API usage soarsverified_publisherTechCrunch - Fitz TepperIt’s no secret that developers are the key to Foursquare’s continued success, and as part of supporting that mission the company just launched a revamped developer site, its first major refresh since 2009. The new site clarifies what the difference is between the developer offerings. The Places API …