This is one of the spam moves , and anyone with an account has likely been a target: A spammer throws in a link to a product along with a mention of your user name, which prompts you to read the tweet, since we're all plugged into our Mentions like Pavlov's dog. A business that seeks to address particular power users with a promotion may consider doing this. But if you really want to tell someone about a promotion who has previously demonstrated that they're into your product, send them a direct message instead.

It's easy to wear out Twitter followers by tweeting every single sale, promotion, or product that you offer. While you obviously have to do some of this, limit yourself to a few promotional tweets per day, and use the rest of your feed to interact with customers. Retweeting articles and blog posts that are relevant to your industry and responding to customer inquiries will put you in the sweet spot.