The document provides a recruiter's checklist for sourcing candidates. It lists 20 different social media platforms, professional networks, and search techniques that recruiters should utilize to find qualified candidates, including checking internal databases and personal contacts, searching LinkedIn, Facebook, Twitter and other social networks, setting up relevant search alerts on Google and other search engines, attending industry events, and searching sites like SlideShare and job boards. The goal is to cast a wide net across the internet to find potential candidates through their online presence and professional activities.