Track Mashup Submit Mashup Mashup: ByOwnerPlanet.com Comments deprecated Comprehensive for-sale-by-owner search engine using Google Maps. Summary Comments (1) Followers (1) Summary Comments Followers Comments (1) Comment * Leave this field blank Post Comment Mark Wonsil (not verified) 2:08 PM Sep. 18 2007 reply While Yahoo! may authenticate a user, the API does not tell you who the user is (their Yahoo! ID). This makes it difficult to grant or prevent access in your application if you don\'t know who the users are.