Definition: Hashtags are words or phrases prefixed with the symbol #,[1][2] a form of metadata tag. They are used within IRC networks to identify groups and topics, as well as short messages on microbloggingsocial networking services such as Twitter, identi.ca or Google+ may be tagged by including one or more with multiple words concatenated, such as those in:
- #Wikipedia is an #encyclopedia
- Source: http://en.wikipedia.org/wiki/Hashtag
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