This document summarizes key points from an OECD report on risk communication by governments and the role of social media in crisis communication. It discusses how effective risk communication is important for public trust, costs, and policy learning. Risk communication systems should include stakeholders, focus on prevention, and facilitate two-way information sharing using new technologies like social media. Social media can help spread information faster than traditional media, though it also presents challenges around speed of response, misinformation, and message confusion. The report identifies 12 good practices for governments to develop multi-layered social media strategies in partnership with citizens and traditional media.