Many law enforcement agencies across the country use social media to disseminate information and engage the communities they serve. To ensure that a department has a clear vision for its social media use and effectively pursues that vision in practice, it is important to develop and regularly update social media policy and guidelines. As part of a survey of law enforcement use of social media, we collected agency social media policies. This brief reviews common themes in that sample of social media policies we collected from 70 law enforcement agencies, describes important considerations, and provides strategies to develop or adapt policies and guidelines to support community engagement.