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A web based tools that allow people or companies or organizations to create, organize and share information, documents and picture/videos in virtual communities and network is called as social media. It can also be said as medium of communication like a newspaper or a radio. The facebook, twitter, Google+, Pinterest etc. are some of the absolute examples of social media. It is becoming a serious part of life as the social sites and applications are increasing. One of the most unique yet understudied feature available on social media platforms is the hashtag (#hashtag). Hashtags is a short combination of words or phrases that follow a hash sign (#), such as #India, #CricketWorldCup etc. Hashtags can help categorize or organize information, increase engagement, attract followers to a certain topic or area. The purpose of this paper is to highlights various aspects of hashtag and its uses in social media.