Log in to Twitter and all you see are continuous tweets from one account. This can be a little too overwhelming and annoying. Twitter users follow a number of people and brands to maintain a balance and uniformity in the kinds of tweets and their nature of content. So maybe tweeting every minute may not be a good idea.
Most brands consider engagement as the crucial part of social media strategies, which is apt and true. But there is a very thin line between being engaging and being annoying. Business end up crossing this line and lose out on potential followers.