This document discusses social media opportunities for the heritage sector. It begins by introducing ProjectBook, a website providing information and resources for heritage building conservation. It then examines the audience for heritage organizations and reviews major social media platforms like Facebook, Twitter, LinkedIn and YouTube. The document outlines how these platforms can be used to engage audiences, develop advocates, promote events, build brands and communities, provide customer service and raise awareness of heritage issues. Overall, it argues that social media presents many free and effective ways for heritage organizations to connect with wider audiences.