This document discusses professional learning networks (PLNs) and how to develop one using social media. It defines a PLN as a teacher-driven global support network that decreases isolation. The benefits of a PLN include accessing ongoing learning, forming connections with others, and deriving competence from those connections. It recommends starting with platforms like Diigo, Twitter, Facebook, or blogging to connect with others, share resources and ideas, and gain different perspectives. Mobile apps allow sharing on the go. The document compares features of different tools and encourages growing one's PLN to continue learning and take advantage of opportunities to connect with others.