This document provides guidance on selecting the appropriate social media platforms for an organization and engaging audiences online. It recommends analyzing target audiences, assessing which platforms meet needs, and going where audiences are already present. Examples are given of successful social media activities by libraries, like contests and events that increased fan engagement. Tips are offered on personal profiles, project pages, commenting, time management, and creating an online community. The overall message is that social media can be a cheap and effective tool for organizations if the right platforms are chosen and audiences are engaged.