Here’s an obvious point: there’s more people online now than there were ten years ago. As a result, there’s more stuff being produced and shared and, because of that, there’s more to miss out on. This is known as the Fear Of Missing Out (or FOMO).
He lists a number of great points from an older Kathy Sierra article, about how to stop worrying about keeping up. I specifically use already:
There is more to the list that you should take a look at, because you're never going to catch up anyway.