NEW YORK (AdAge.com) -- In our continuing look at how agencies are creating their social media capabilities and services, we talk with MediaCom North America CEO Doug Checkeris. Some agencies, like Edelman, have hired in-house social media teams. Others, like BBDO, are using young mentors to teach all their executives how to Facebook, blog, Twitter and otherwise function and think like authentic social media players. But MediaCom is taking a different route.