Launch the Share to Facebook modal, allowing users to share local media files to Facebook. Accepts a postTextSuggestion string for the default text of the Facebook post. Requires a filePath string as the path to the image to be shared to Facebook. This image should be located in your app's internal storage directory. Requires a contentType indicating the type of media to be shared (only 'photo' is currently supported). The payload for the result is defined as
ovrShareMediaResultHandle. ovrMessage_Media_ShareToFacebook will be generated in response.
postTextSuggestion: const char *
this text will prepopulate the facebook status text-input box within the share modal
filePath: const char *
path to the file to be shared to facebook