Frontières, World Bank, and other humanitarian groups. Scientific research OpenStreetMap data was used in scientific studies. For example, road data was used for research of remaining roadless areas and in the creation of the annual Forest Landscape Integrity Index. Route planning In February 2015, OpenStreetMap added route planning functionality to the map on its official website. The routing uses external services, namely OSRM, GraphHopper and MapQuest. Downstream users A variety of popular services incorporate some sort of geolocation or map-based component. Notable services using OpenStreetMap for this include: Amazon uses OpenStreetMap for navigation and has a team who revises the map based on feedback from drivers. Apple Inc. unexpectedly created an OpenStreetMap-based map for iPhoto for iOS on , and launched the maps without properly citing the data source – though this was corrected in 1.0.1. OpenStreetMap is one of the many cited sources for Apple's custom maps in iOS 6, though the majority of map data is provided by TomTom. As of February 2021, Apple was the most prolific corporate editor, responsible for 80% of edits to existing roads. Ballardia (games developer) launched World of the Living Dead: Resurrection in October 2013, which has incorporated OpenStreetMap into its game engine, along with census information, to create a browser-based game mapping over 14,000 square kilometres of greater Los Angeles and survival strategy gameplay. Its previous incarnation had used Google Maps, which had proven incapable of supporting high volumes of players, so during 2013 they shut down the Google Maps version and ported the game to OpenStreetMap. Craigslist switched to OpenStreetMap in 2012, rendering their own tiles based on the data. Facebook uses the map directly in its website/mobile app (depending on the zoom level, the area and the device), with a rendering style designed by Stamen Design as of 2021. Facebook has also used AI technology to detect roads absent from OpenStreetMap but visible in aerial imagery ("mapwith.ai" / "Map with AI"), and has developed an OpenStreetMap editing tool ("RapiD") for adding these roads to OpenStreetMap. The "Daylight Map Distribution" is a snapshot of OpenStreetMap data created by Facebook that claims to be clean of vandalism. Flickr uses OpenStreetMap data for various cities around the world, including Baghdad, Beijing, Kabul, Santiago, Sydney and Tokyo. In 2012, the maps switched to use Nokia data primarily, with OpenStreetMap being used in areas where the commercial provider lacked performance. Foursquare started using OpenStreetMap