It’s been said that everyone on Twitter is talking and no one is listening, unless, of course, you’re already famous. Thus, it’s a somewhat iffy social media platform for book marketing. Any success you have on this platform will be directly proportionate to how many followers you have and their quality.
Whatever you do, don’t ever buy followers! The chances of them having the slightest interest in your books is so low, you probably have a similar or even better chance of winning the lotto. One thing you can do to try and place your tweets in the right news feeds is to use appropriate hashtags. It’s still a huge crap shoot, but does increase your chances slightly.