This post originally appeared on the American Express OPEN Forum, where Mashable regularly contributes articles about leveraging social media and technology in small business.
If you’ve used Twitter () for more than a couple of hours, you’ve probably already seen a tweet or two containing a word with the hash symbol (“#”) attached to it. That’s what Twitter users call a “hashtag,” and at any given time at least one of them can usually be found among the trending topics on Twitter. But what exactly is a hashtag?
Hashtags are essentially a simple way to catalog and connect tweets about a specific topic. They make it easier for users to find additional tweets on a particular subject, while filtering out the incidental tweets that may just coincidentally contain the same keyword. Hashtags are also often used by conference and event organizers as a method of keeping all tweets about the event in a single stream, and they’ve even been used to coordinate updates during emergencies. In fact, hashtags were first popularized during the 2007 San Diego wildfire, when the tag #sandiegofires was used to identify tweets about the natural disaster.
You can create a hashtag simply by appending the hash symbol to a word, like this: #hashtag.
http://mashable.com/2009/09/04/twitter-hashtags-business/
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