YouTube can be used by government agencies to engage citizens. The key reasons to use YouTube include its large audience, ability to share informative and relevant content, and potential for videos to go viral. YouTube for Government provides features like custom channel branding and longer uploads. Agencies should post content that is relevant, informative, and engaging to citizens while also building an online community. They can use tools like Google Moderator, annotations, and Insight to better engage with viewers and understand their audiences.