This document discusses how digital communities of practice and social media can improve community engagement and sustainability. It defines sustainability and communities of practice, and explains how social media platforms like Facebook and Twitter can be used to create a digital community and increase participation. Specific tips are provided for boosting engagement on social media, such as posting at certain times, using images and questions, and keeping posts concise. Online resources and tools for sharing videos, surveys, petitions, fundraising and recycling are also listed.