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, offering users an easy way to communicate around a single theme.
For example: #SocialMedia.
While the history of the hashtag (certainly in its modern use) traces back to IRC, it was only with the rise and dominance of Twitter that this powerful tool really came to prominence.
Today, hashtags are used everywhere, particularly by brands in the music and entertainment industry, and they’ve now become so popular, and so normal, that even Facebook is looking to get in on the action. Check the infographic below for your fast, one-page guide to everything you need to know about hashtags.