According to hashtags.org “hashtags” are a community-driven convention for adding additional context and metadata to your tweets. They’re like tags on Flickr, only added inline to your post. You create a hashtag simply by prefixing a word with a hash symbol: #hashtag.

Hashtags are getting more and more popular (despite the fact some people are against them wishing their Twitter stream to be metadata-free and “as human a form of communication as possible”). Using the sign # before a word, means that you want to talk about a particular thing (event, individual or place) on Twitter.

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