aug 23, 2007 - First Hashtag/Retweet

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Chris Messina was the creator of the hashtag. Twitter thought the hashtage was "too nerdy" and wouldn't work. After all everyone loved it and now about 10% of tweets use hashtags.

http://business.time.com/2013/11/07/the-7-most-important-moments-in-twitter-history/

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