My advice is to focus your time and effort as startups really do not have much time to spare on efforts that are not generating customer opportunities. Twitter does take a lot of time to build credibility in your field if your brand is not yet established. Other services like Instagram or LinkedIN work well as they offer additional capabilities to engage and communicate with your existing audience. You would be better served by joining business portals or groups in your subject area, getting engaged in the discussion and offering support and build upon it or even concurrently with a Twitter presence.