What is a Hashtag? In recent years has appeared a tool that has literally invaded all social networks; It is a diez (#) which is placed before a word and which turns into a hashtag. Hashtags have become popular with Twitter, while Facebook has only started using them since 2013. Twitter has implemented this feature to group the different messages on the platform, and its operation has become very trivial, just enter a simple word preceded by the symbol of the diez your word is found in the list of hashtags. On Instagram the operation is very similar, except that instead of grouping messages, instagram groups images. Thanks to a set of hashtags included in the description of the photo, each user can view this photo by simply entering the keyword corresponding to the hashtag in the search bar of the platform. For example, if a beach photo has a hashtag "#mer", all those in the search engine will scan the word "sea" will also display this photo. H