(OAuthException - #200) (#200) The user hasn't authorized the application to perform this action when post on facebook by through winows phone 8 code:
dynamic fbPostTaskResult = await instance.PostTaskAsync("me/feed", postParams);
permessions add in
session = await App.FacebookSessionClient.LoginAsync("user_about_me,read_stream,publish_actions");
Debug access token on facebook app display
App ID -- User ID -- Issued 1409307661 Expires 1414491661 Valid True Origin Mobile Web Faceweb Scopes public_profile
Solve by adding permession publish_action and provide description and detail on app status & review