I want to upload video on fb timeline and tag user's friends on it. Uploading is pretty simple. I add binary data of video:
someUrlForm.AddBinaryData("file", binaryData, fileName, "multipart/form-data");
and call Graph API request that gives me uploaded video id:
https://graph-video.facebook.com/me/videos?title={0}&description={1}&access_token={2}
Documentation suggests to use "mention" in video description like @[main_user_id] but so I can't tag people who doesn't have my app. Now /me/friends API is used for retrieving "main" (not taggable) id's of users who add the application.
The only way I guess is to use actions as described here. It has tags field for taggable_id. Problem is I want to tag not a self-hosted object form link but existing video on timeline.
Maybe I need to create custom action to upload video with tags?
The Graph API Video object doc specifies support only for page mentioning of the form @[page-id], and that is subject to review.