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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 hash character (or number sign) # 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 then present each message that has been tagged with it.For example, on the photo-sharing service Instagram the hashtag ''#bluesky'' allows users to find images that have been tagged as containing the sky, and ''#cannes2014'' is a popular tag for images from the 2014 Cannes Film Festival. Hashtags can be used to collect public opinion on events and ideas at the local, corporate, or world level. For example, searching Twitter for ''#worldcup2014'' returns many tweets from individuals around the globe about the 2014 FIFA World Cup. Hashtags have been used for social activism. The Twitter hashtags ''#notallmen'' and ''#yesallwomen'' were used to debate misogyny after the 2014 Isla Vista killings; while the ''#illridewithyou'' hashtag was created to tag messages of support for Australian Muslims using public transport after the 2014 Sydney hostage crisis. A hashtag was also used for the Black Lives Matter movement, ''#BlackLivesMatter''. Because of its widespread use, ''hashtag'' was added to the ''Oxford English Dictionary'' in June 2014.〔(【引用サイトリンク】url=http://www.theregister.co.uk/2014/06/13/hashtag_added_to_the_oed/ )〕〔(【引用サイトリンク】url=http://public.oed.com/the-oed-today/recent-updates-to-the-oed/june-2014-update/new-words-notes-june-2014/ )〕 The term ''hashtag'' can also refer to the hash symbol itself when used in the context of a hashtag.〔(【引用サイトリンク】url=http://www.oed.com/view/Entry/389023#eid301493073 )〕 ==Origin and use== The number sign was often used in information technology to highlight a special meaning. In 1970 for example, 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. In 1978, Brian Kernighan and Dennis Ritchie used ''#'' in the C programming language for special keywords that had to be processed first by the C preprocessor. Since before the invention of the hashtag, the number sign has been called the "hash symbol" in some countries outside of North America. The number sign then appeared and was used within IRC networks to label groups and topics.〔"Channel Scope". Section 2.2. RFC 2811〕 Channels or topics that are available across an entire IRC network are prefixed with a hash symbol # (as opposed to those local to a server, which use an ampersand '&'). The use of the number sign in IRC inspired〔(【引用サイトリンク】title=#OriginStory )〕 Chris Messina to propose a similar system to be used on Twitter to tag topics of interest on the microblogging network. He posted the first hashtag on Twitter: Internationally, the hashtag became a practice of writing style for Twitter posts during the 2009–2010 Iranian election protests, as both English- and Persian-language hashtags became useful for Twitter users inside and outside Iran. The first use of the term "hash tag" was in a blog post by Stowe Boyd, "Hash Tags = Twitter Groupings," on August 26, 2007, according to lexicographer Ben Zimmer, chair of the American Dialect Society's New Words Committee. Beginning July 2, 2009, Twitter began to hyperlink all hashtags in tweets to Twitter search results for the hashtagged word (and for the standard spelling of commonly misspelled words). In 2010, Twitter introduced "Trending Topics" on the Twitter front page, displaying hashtags that are rapidly becoming popular. Twitter has an algorithm to tackle attempts to spam the trending list and ensure that hashtags trend naturally. In China, microblogs Sina Weibo and Tencent Weibo utilize a double-hashtag "#HashName#" format, since the lack of spacing between Chinese characters necessitates a closing tag. In contrast, when using Chinese characters (and orthographies with similar spacing conventions) on Twitter, users must insert spacing before and after the hashtagged element (e.g. '我 #爱 你' instead of '我#爱你') or insert a zero-width non-joiner character before and after the hashtagged element, to retain a linguistically natural appearance, such as '我#爱你'. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「hashtag」の詳細全文を読む スポンサード リンク
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