Want Customer Service? Post Complaints on Twitter - Smart Money Want to complain about a faulty product or shabby service? Or ask someone how to set up your cable modem? If you can do so in 140-characters or less, then your odds of getting a response are pretty high. A growing numbers of big-name companies, including Comcast, JetBlue and UPS, have found a new use for Twitter: customer service. Now, in a short, to-the-point tweet, consumers can ask questions, report problems and air grievances. Even better: Tweeting a complaint is one way to make sure it actually gets heard -- and renders a response.