A hashtag is a type of label or metadata tag used on social network and microblogging services which makes it easier for users to find messages with a specific theme or content. Users create and use hashtags by placing the number sign or pound sign (colloquially known as the hash character # in reference to its resemblance to several slices or chops with a sharp implement) in front of a word or unspaced phrase, either in the main text of a message or at the end. Searching for that hashtag will yield each message that has been tagged with it. A hashtag archive is consequently collected into a single stream under the same hashtag. For example, on the photo-sharing service Instagram, the hashtag #bluesky allows users to find all the posts that have been tagged using that hashtag.
Because of its widespread use, hashtag was added to the Oxford English Dictionary in June 2014.The term hashtag can also refer to the hash symbol itself when used in the context of a hashtag.
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