This document discusses how Twitter can be used as a personal learning network (PLN) to expand one's professional development opportunities and knowledge beyond formal training. It provides examples from educators who have learned more from their Twitter PLNs than traditional professional development. Tips are offered on how to get started with Twitter, including following others with similar interests, participating in chats on various topics, introducing yourself, and engaging with your followers. Ways to promote your work and library on Twitter through regular tweets, photos, and tools like Buffer are also described.