3. Distribute promotions
Some companies are finding that Twitter is an effective channel for sending out promotional messages. Timely sales and coupons are easy to distribute on Twitter, and the fast nature of the Twitterverse means that people can respond to the promotions quickly.
DellOutlet regularly posts offers with codes for special discounts:

But let's face it, blasting people with your news and special offers simply won't cut it for the great majority of Twitter users. Most people don't want to follow you on Twitter for the factual information and offers you might publish. They're interested in you because they want to engage with the brand in some way. They want to hear the voice and personality of the brand.