Social media is a very powerful communication tool for common man but in recent times many incidents came to light in which it is grossly misused. Social media is used in mobilizing people for a movement and so it is misused in creating tensions among communities. When there is a vast growth in android smart phones, it is very easy to share any incident quickly. Technology is misused in morphing photographs and videos and circulating fake news that leads not only to disparage personal reputation of an individual but also has damaged the fabric of society wide and apart. The objective of the study is to find out the prime reason of Basirhat communal riots, 2017 and to discover whether social media had contributed in instigating the riots. During our investigation of facebook posts at the time of riots, we found that maximum number of people wrote and shared highly inciting posts and even they appealed to attack on people of Muslim community. Just one fourth of total users included in the study talked about peace and harmony in their posts and least number of users discussed about law and order situations.