Comcast on Thursday formally announced a new service that will let college students at seven universities stream live TV and video on-demand programming across their personal laptops, smartphones, and tablets while connected to campus Wi-Fi. Dubbed Xfinity On Campus, the service is included as part of each student’s room and board fees — which means it’s also only available to those residing in on-campus housing. The whole effort is squarely aimed at millennials who are spending more and more time watching their favorite shows and movies away from a TV set. Comcast wants to get these younger college viewers — many of whom are perfectly content living in a world of Netflix, Hulu Plus, and shared HBO Go logins — hooked on cable in hopes that ultimately they’ll become paying customers once they’ve graduated.