This document discusses using social media in teaching. It outlines 7 principles of good teaching and maps how different social media affordances like communication, exploration, curation and demonstration can help implement these principles. The principles are initiating instructor-student contact, providing collaborative learning opportunities, integrating active learning, giving regular feedback, emphasizing time on task, communicating high expectations, and developing inclusive learning environments. Social media like blogs, YouTube, Flickr and Tumblr are presented as tools that can support these principles through their various features that allow sharing, commenting, posting media, organizing content and demonstrating concepts. The document encourages brainstorming ideas for applying specific social media in one's own course to engage students.