FBSDKDefaultAudience
enumFBSDKDefaultAudience:NSUInteger{}
FBSDKDefaultAudience enum
Passed to openURL to indicate which default audience to use for sessions that post data to Facebook.
Certain operations such as publishing a status or publishing a photo require an audience. When the user grants an application permission to perform a publish operation, a default audience is selected as the publication ceiling for the application. This enumerated value allows the application to select which audience to ask the user to grant publish permission for.