If you’ve been on Twitter for any amount of time, you’ve no doubt seen tweets that contain the “#” symbol followed by a word or group of words. The first time I noticed this, I thought it was simply to add emphasis to a word or phrase, and I was partly right, but, only partly right. I was very far from understanding why it was there, and what it actually did.
The hashtag (#) was organically created by Twitter users to categorize messages, thereby helping them find interesting tweets. Hashtags were popularized during the San Diego forest fires in 2007 when Nate Ritter used the hashtag “#sandiegofire” to identify his updates related to the disaster. From there it took off!
http://www.thesocialbizbuzz.com/blog/2011/11/making-sense-of-twitters-hashtag-technology/
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