This document compares how three individuals with different ages and backgrounds use LinkedIn, Facebook, and Twitter. Safak, age 18-34, spends seven hours a month on Facebook to keep up with friends and brands. Rachel, age 26-44, spends an hour and a half on Twitter to stay up-to-date on news and events. Ed, also age 26-44, spends 20 minutes on LinkedIn to network, join groups related to his work, and find career opportunities. The document then provides tips for using LinkedIn, including completing your profile, building your network, finding influencers, and customizing your news feed and daily routine.