Definition of #hashtag

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A hashtag is used to "tag" or group messages on twitter.

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Acronym for #NumberSign or #Pound sign~millions using telephone TouchTone keypad got familiar with Star sign * & Pound Sign # Please See ~ http://en.wikipedia.org/wiki/Pound_sign & also http://en.wikipedia.org/wiki/Number_sign & http://en.wikipedia.org/wiki/Tag_(metadata)#Hash_tags

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Hashtags are the new parenthesis. #PithySomethingHere

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Open University staff to communicate together

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It's a comment tag for configuration files