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Because of its widespread use, hashtag was added to the Oxford English Dictionary in June 2014.The US pound sign, number sign or hash symbol "#" is often used in information technology to highlight a special meaning.Three hashtags are seen by some as the "absolute maximum", and any contribution exceeding this risks "raising the ire of the community." As well as frustrating other users, the misuse of hashtags can lead to account suspensions.
Users create and use hashtags by placing the number sign or pound sign (also known as the hash character) in front of a string of alphanumeric characters, usually a word or unspaced phrase, in or at the end of a message.
Messina’s suggestion to use the hashtag was not adopted by Twitter, but the practice took off after hashtags were widely used in tweets relating to the 2007 San Diego forest fires in Southern California.
According to Messina, he suggested use of the hashtag to make it easy for "lay" users to search for content and find specific relevant updates; they were for people who do not have the technological knowledge to navigate the site.
In many cases other characters are also allowed, in particular accented characters used in many languages, but handling may vary from one client to another, and from time to time as standards evolve.
A discussion of hashtag standards suggests that if #Romeo&Juliet is used, different Twitter clients might link to #Romeo, #Romeo&, or #Romeo&Juliet.
Hashtags are not case sensitive; a search for “#hashtag” will find “#Hash Tag”.