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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.