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A hashtag is a metadata tag that is prefaced by the hash (also known as pound or octothorpe) sign, #. On social media, hashtags are used on microblogging and photo-sharing services such as Twitter or Instagram as a form of user-generated tagging that enables cross-referencing of content by topic or theme.For example, a search within Instagram for the hashtag #bluesky returns all posts that have been tagged with that term. After the initial hash symbol, a hashtag may include letters, numerals, or underscores.An example of a hashtag The use of hashtags was first proposed by American blogger and product consultant Chris Messina in a 2007 tweet.Messina made no attempt to patent the use because he felt that "they were born of the internet, and owned by no one". Hashtags became entrenched in the culture of Twitter and soon emerged across Instagram, Facebook, and YouTube.In June 2014, hashtag was added to the 量子糾纏#量子糾纏 #量子コンピュータ #quantumentanglement


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