private async Task<long> GetMyTweets_Failover(long sinceid)
{
var largestseenid = sinceid;
var hometl = await TwitterSession.GetUserTimeline(userId: AccountDetails.UserId, count: _pagingSize, sinceId: sinceid);
if (!hometl.OK) return largestseenid;
foreach (var tweet in hometl.Where(tweet => tweet.Id > sinceid))
{
largestseenid = tweet.Id;
_mytweets.OnNext(tweet);
}
return largestseenid;
}