This document discusses the responsible and ethical use of social media by criminal defense lawyers. It provides guidance on understanding client confidentiality issues with social media, identifying what can and cannot be shared, and implementing a social media policy for a law firm. Key points include maintaining client confidentiality, being honest, timely and transparent in all social media posts, and obtaining client consent before sharing any case-related information with other lawyers. Examples are given of appropriate and inappropriate uses of Facebook, Twitter, and developing social media policies for law firms.