This document discusses building a professional learning network (PLN) using online tools. It defines a PLN as a flexible, teacher-driven space for personalized professional development through collaboration. The benefits of PLNs include access to expertise, reducing isolation, and finding best practices. Key tools discussed are RSS feeds for information aggregation, social bookmarking sites like Diigo, and social media platforms like Edmodo, Twitter and Ning for connecting with other educators. The document provides guidance on information literacy, networking etiquette, and avoiding overload through focusing on a few high-quality sources and connections at first.