public async Task Start()
        {
            await Task.Run(async() =>
            {
                var url = $"https://www.reddit.com/r/{_subredditName}/new.json";

                var existingPosts = await _reddit.GetPosts(url);
                _knownPostIds     = existingPosts.Select(p => p.Id);

                Observable
                .Interval(_interval)
                .Subscribe(
                    async x =>
                {
                    try
                    {
                        var newPosts = await _reddit.GetPosts(url);

                        foreach (var post in newPosts.Where(p => !_knownPostIds.Contains(p.Id)))
                        {
                            _posts.OnNext(post);
                        }

                        _knownPostIds = newPosts.Select(p => p.Id);
                    }
                    catch (Exception ex)
                    {
                        _onError(ex);
                    }
                });
            });
        }
        private async Task GetAllPosts(string baseUrl)
        {
            var url   = baseUrl;
            var count = 0;
            IEnumerable <RedditPostData> posts = null;

            do
            {
                try
                {
                    posts = await _reddit.GetPosts(url);

                    if (posts.Any())
                    {
                        foreach (var post in posts.Where(p => p.CreatedUtc.FromUnixTime() >= _minimumDate))
                        {
                            _posts.OnNext(post);
                        }

                        count += 25;
                        var lastPost = posts?.Last();

                        url = $"{baseUrl}&count={count}&after={lastPost?.Name}";

                        _stop = posts == null || posts.Any(p => p.CreatedUtc.FromUnixTime() < _minimumDate);
                    }
                    else
                    {
                        _stop = true;
                    }
                }
                catch (Exception ex)
                {
                    _logError(ex, "Error retrieving posts");
                }
            }while (!_stop && posts != null && posts.Any());
        }