A content item, e.g., an icon or advertisement content, is selected for placement in a display environment (e.g., on a map or adjacent to a map) in response to a request for the display environment based on a probability that the content item is relevant to a user that is requesting the display environment....http://www.google.de/patents/US8201089?utm_source=gb-gplus-sharePatent US8201089 - Content item selection
