I haven't used them, but for a few years, I used IFTTT to schdule them, via Google Calander. I set so many auto tweets in motion, I still have some running and can't figure out which of my former Twitter accounts is generating them LOL - But IFTTT changed the way they do their "recipes" now, so I don't use them - purposely. I tried Buffer and another one, but didn't like them like IFTTT. I heard of Tweetdeck. I may have to give them a try. Thanks :-)