I have three Twitter accounts. The one I use for writing and book reviews is @barbsbooks. It’s my original account with the largest following. It’s also the one with the least real interaction. I think the reason is that I changed the focus of my business in 2015 and my audience has adjusted accordingly.
I have the most interaction on my smallest account. That one focuses on my local area, photography, art, and nature. I’m very interested in those subjects and I now have several people who interact with me there. Of course, I also make an effort to interact with them. Without interaction, I don’t think one gets too much out of Twitter. It would just be a giant bulletin board. I also believe the more you are active in Facebook groups and on other writing sites, the wider the circle of those you know on Twitter grows. You tend to interact more with people you actually know.
I’ve been ignoring Medium for three years now, and a friend on one of the other writing sites persuaded me to come back and have a look around. I’m glad I did. If Medium had been like this when I joined, I might not have started so many blogs. I can see that Medium might be all a writer would need to build an audience of readers. Less time spent keeping up with many social sites provides more time for actual writing. So maybe one doesn’t need Twitter.