Social networks, particularly public ones, have become part of the fabric of how we communicate and collaborate as a society. With value from micro-level personal networking to macro-level outreach, social networking has become pervasive in people's lives and is now becoming a significant driving force in business. These new platforms have provided new approaches to many critical enterprise functions, including identifying, communicating, and gathering feedback with customers (e.g., Facebook, Ning); locating expertise (e.g., LinkedIn); providing new communication platforms (e.g., Twitter);...