It was the last decade which represented "typical" American life as it had come to be known from the mid 1940's on. Fashion, music, movies, the introduction and changing of TV, etc... were regularly different, but the overall rhythm of life was the same for more than 40 years. Communication methods were the same, transportation was the same, everyone essentially watched the same TV, saw the same news, read the stories in the paper, the evening routine was consistent, weekly routine was school, work, church, etc... were consistent. The various divisions of life were consistent, work and home were separate. People were, generally speaking, on the same page.
Then the interwebs came into existence. This began the age of "always-on, instant, & reachable". Instant non-voice based communication with anyone anytime of day, anywhere in the world. As with communication, so it happened with shopping, entertainment, information. Generally it was seen, at the time, as a huge benefit to mankind, and it's reach was still limited. You were tethered while using it so you could still step away from it when you wanted or needed to. There were still aspects of life it hadn't invaded.
Then came the next massive shift in the new millennium, the availability of the cell phone to the majority. That pushed the digital aspect of life into far more areas than ever before. That was the beginning of where people started to get overloaded. There was very little opportunity left to disconnect. Because most people could be reached at most times it became to be expected that people could and should be reachable at most times. The divisions of the various aspects and routines of life began to seriously crumble.
The last step in this progression that made the interwebs omnipresent was the smartphone. Now everything could be done at any time, everywhere. Your entire life through a single screen that worked anywhere. People reached peak overload. People were expected to be able to do everything that everyone else needed anywhere at any time. The divisions of life were abolished. Now your boss could get ahold of you no matter where you were. The constant communication and information lead cultural mutation to occur at a far greater pace than before. Suddenly everyone had more communication, information, connection, and content than ever before, but had never been more disconnected from each other than at any point in recent history. People were more fragmented, balkanized, and overloaded than ever. That's where we are currently.
At least, that's my theory on the subject.