How NOT to use hashtags on Twitter

When I teach people how to tweet, hashtags are usually not in the “Twitter 101” playbook. Hashtags are used by experienced Twitter users to monitor certain subjects and gather information from large groups of people, most of whom you probably aren’t following. Professor Barbara Nixon recently witnessed a few hashtag faux pas taking place on CNN’s Twitter account ; she provided a  detailed tutorial on how to use Twitter hashtags  effectively. In general, it’s best not to use such gen…