Social-networking tools aren't just for flirting. The evolving world of Internet
communication -- blogs, podcasts, tags, file swapping -- offers students radically new ways to
research, create, and learn. But, too often, schools use computers as little more than glorified
workbooks, and that's criminal, says Chris Lehmann, principal of Philadelphia's Science Leadership
Academy. He explains why teachers should embrace networking and how they can use it to
improve education.