What is a hashtag? Well, on Twitter – and increasingly everywhere else – a hashtag is a word or phrase (with no spaces or punctuation) prefixed with the # symbol which gives users an easy way to communicate around a single theme.

Example: #Twitter.

The use of hashtags in social media originated back in August 2007, when designer Chris Messina asked his Twitter followers how they felt about using the pound sign (#) to group conversations on the micro-blogging platform, and thus became the first person to use the hashtag in its modern capacity.

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