The rapid growth of social media platforms has transformed the way individuals interact, communicate, and engage with information. Social media has become an integral part of modern day communication and has had a significant impact on the way people interact with each other. Social media regulates society and has the power to alter morality, human behaviour, and outcomes. It reflects in two ways: positive as well as negative. The study was conducted to explore the impact of social media on behaviour and its influence on criminal activities. The sample size included 200 individuals in the age group of 15 to 25 years, including both males and females, from the city of Thiruvananthapuram, Kerala. The purposive sampling method was adapted, and a structured questionnaire was used for the data collection. In light of this study, it was revealed that the impact of social media is highly reflected in the behaviour of people and its influence on criminal activities. The youth have been impacted by social media in terms of the tendencies that are visible on social media that lead to criminal activity. The study's main finding is that social media has changed people's behaviour, and that behaviour has caused certain people to engage in criminal activity.