Mention Tagging: http://developers.facebook.com/docs/opengraph/mention_tagging/
Here is my code:
NSURL *requestUrl = [NSURL URLWithString:[NSString stringWithFormat:@"https://graph.facebook.com/me/feed?access_token=%@",self.fbAccessToken]];
...
[self.fbRequest setPostValue:@"hi, @[555066305] " forKey:@"message"];
But it's not working.It just print "hi, @[555066305] " instead of "hi,@somebody".