Using ENR Indexes Readers of ENR direct a steady stream of questions about the magazine’s indexes and how to accurately apply them to various construction projects.

Social media marketing (SMM) is the use of social media platforms to interact with customers to build brands, increase sales, and drive website traffic.

Charles Robinson has been a senior writer for Yahoo Sports since 2004, specializing in NFL and investigative reporting. Follow him on Twitter @CharlesRobinson.