It is a form of metadata tag.Words in messages on microblogging and social networking services such as Twitter, Facebook, Google+ or Instagram may be tagged by putting "#" before them, either as they appear in a sentence, or appended to it.
Hashtags make it possible to group such messages, since one can search for the hashtag and get the set of messages that contain it. A hashtag is only connected to a specific medium and can therefore not be linked and connected to pictures or messages from different platforms.
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