The pound sign was adopted for use within IRC ( Internet Relay Chat) networks around 1988 to label groups and topics. In 1970, the number sign was used to denote immediate address mode in the assembly language of the PDP-11 when placed next to a symbol or a number, and around 1973, '#' was introduced in the C programming language to indicate special keywords that the C preprocessor had to process first. The number sign or hash symbol, #, has long been used in information technology to highlight specific pieces of text. Origin and acceptance Chris Messina suggested using hashtags on Twitter In June 2014, hashtag was added to the Oxford English Dictionary as "a word or phrase with the symbol # in front of it, used on social media websites and apps so that you can search for all messages with the same subject". ![]() Hashtags became entrenched in the culture of Twitter and soon emerged across Instagram, Facebook, and YouTube. Messina made no attempt to patent the use because he felt that "they were born of the internet, and owned by no one". The use of hashtags was first proposed by American blogger and product consultant Chris Messina in a 2007 tweet. After the initial hash symbol, a hashtag may include letters, numerals, or underscores. ![]() For example, a search within Instagram for the hashtag #bluesky returns all posts that have been tagged with that term. It is still sometimes known as the pound sign. On social media, hashtags are used on microblogging and photo-sharing services such as X (formerly Twitter) or Tumblr as a form of user-generated tagging that enables cross-referencing of content by topic or theme. Several hashtags are used in this post, including "CCCCWI", "TeamRhetoric" and "AcademicTwitter".Ī hashtag is a metadata tag that is prefaced by the hash symbol, #. For the typographical symbol, see Number sign.Ī post on the social media platform Twitter.
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