teachthought.com - What is a hashtag?A word or phrase preceded by a “#.”How do hashtags work?Twitter can be a busy place with lots of tweets–and thus lots of “noise.”A #hashtag is a way to aggregate tweets that are appended with a hashtag. Picture it like a magnet that attracts all messages categorized by that topical word or phrase.Who can use hashtags?Anyone. When you tweet and want your message to be part of a larger conversation beyond your followers, add a relevant hashtag from the list below to the end of your message, and you’ll automatically reach anyone who is monitoring the same hashtag.