From Doug Belshaw:

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:

• find the best aggregators
• Unsubscribe from as many things as possible
• Celebrity and gossip is a black hole
• Am realistic about what I’ll do and toss the rest

There is more to the list that you should take a look at, because you’re never going to catch up anyway.