This document discusses how online networking can be used for professional development. It describes how the internet has evolved to allow anyone to create websites and blogs, and connect with others through social media. It defines a personal learning network as connections made through online groups, blogs, social bookmarking, and other tools to facilitate sharing of information. Examples are given of individuals who have built large learning networks by actively engaging online over many years through blogging, commenting on others' content, and participating in groups. A variety of social media tools are presented that can be used to connect with others, including email lists, blogs, wikis, social networks, photo/video sharing, bookmarking, and more.