America used to have a shared culture because of gatekept, oligopolistic media cos. whose power was incredible. Cable TV changed that with fragmentation so you weren't forced to watch one of the Big Three anymore and could pick your own media diet. The transmission was still mostly one way but niches began to form. The internet added even more niches AND allowed two-way transmission. You could even create your own niche now.
It's easier to have a shared national culture when everyone is exposed to the same media, and harder to find an outlet to get exposure to and for different points of view. It's different now. The world is not going to go back to how it used to be, but TBH I'd rather it didn't.
This is the world John Malone has built and I will be DAMNED if I see you people tear it down now. Look at the joys. More high quality content is available than ever. You can have anything you want delivered to your house for free in a couple days. You can watch WHAT YOU WANT WHEN YOU WANT. I remember when I was a kid and I had a craving to watch my Scoobies, but when my Scoobies were over I couldn't just get more. I could watch the same ones over again, if I recorded them. But I couldn't get any Scooby episode EVER with the click of the button.
A remote control that had every Scooby ever made... PLUS Tom & Jerry, He-Man, and the Flintstones just to name a few. It would have blown my mind; in fact, that WAS basically my dream as a kid. To take control of the programming schedule.
Now it's possible and we can all watch Game of Thrones and Breaking Bad and Mad Men and a dozen zombie shows or foreign language stuff and ALL WE HEAR ABOUT IS HOW AWFUL TWITTER AND FACEBOOK ARE?
We're more polarized than ever, but that's part of the game now. Some of us have seen the light and you can know us by OUR KNOWN TRUTH...
The Few Became Many, the Many Became All, and now All Becomes One...