22/09/16 Do You Know What A Hashtag Really Is?
The hashtag is a word or phrase preceded by the “#” sign. #Hashtags are a simple way to mark the topic (or topics) of social media messages and make them discoverable to people with shared interests. On most social networks, clicking a hashtag will reveal all the public and recently published messages that also contain that hashtag. Hashtags first emerged on Twitter as a user-created phenomenon and are now used on almost every other social media platform, including Facebook, Google+, Instagram, Vine and Pinterest.
This thing is called an octothorpe.