Candidates can leverage social media for UPSC exam preparation by following educational channels, networking with fellow aspirants, and accessing current affairs updates. Platforms like YouTube offer a variety of lectures and tutorials, while forums and groups on sites like Facebook or Telegram provide collaborative spaces for discussion and knowledge sharing. Engaging in online quizzes and competitions can enhance retention of information. Social media can also facilitate insights from experienced candidates and mentors, offering practical tips and motivational content, thus creating a comprehensive support system for effective preparation.