public static Tag[] TagsInMediaList(InstagramMedia[] media)
        {
            List<string> t = new List<string>();
            foreach(var instagramMedia in media) {
                foreach(string tag in instagramMedia.tags) {
                    if(!t.Contains(tag))
                        t.Add(tag);
                }
            }

            return TagsFromStrings(t.ToArray());
        }
        public User[] UsersInMediaList(InstagramMedia[] media)
        {
            List<User> users = new List<User>();
            foreach (var instagramMedia in media)
            {
                if(!users.Contains(instagramMedia.user))
                    users.Add(instagramMedia.user);
            }

            return users.ToArray();
        }