I spent some time recently searching for new and interesting blogs (always keeping an eye out for recruiting/HR thought leadership!), and Glen Cathey's blog Boolean Black Belt stood out as a good resource for online recruitment and sourcing. He clearly breaks down specific techniques and search strategies, and has an easy to read style supported with graphs and graphics.
He recently put together a "best of" page with some of his top posts. Seems like an excellent starting place for up and coming recruiters, or those looking to polish or upgrade their e-recruitment skills.
