There's also value in having a shared culture when in social scenarios. Those hours of watching Simpsons episodes over and over give me points of reference and things to discuss with new people. Those social connections and the ability to make new social connections help when thrown into a new situation (going to college, starting a new job, moving to a new state, ending a relationship and rebuilding social connections).

I wonder if it's some innate drive for kids because it comes up in multiple generations; listening to music, watching tv, on facebook or youtube?