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Hashtag
A hashtag is a word or a phrase prefixed with the symbol, a form of metadata tag. Short messages on microblogging social networking services such as Twitter, Tout, identi. ca, Tumblr, Instagram, or Google+ may be tagged by including one or more with multiple words concatenated, e.g. : #Wikipedia is an #encyclopedia Hashtags provide a means of grouping such messages, since one can search for the hashtag and get the set of messages that contain it.
