Building a community online involves engaging and interacting with others. Whether it's a tweet, Facebook post, or article, you'll receive comments. Learn the best practices for responding to comments, knowing your audience, and building authority online. Martin Shervington explains the role of psychology in moderating a healthy community, and provides tips on increasing engagement by posting attention-getting content such as images and questions. Plus, find out how to avoid a negative community, with tips on dealing with trolls and getting conversations back on track.