The Harvard Business Review has a good (and long) article entitled, “Death by Information Overload.” They provide a good overview on information overload (be it email, social network-related, and regular information/reading/processing overload). They also provide a few suggestions, but the lifehackers of us have already tried these solutions.
I have to admit, I’ve recognized I am becoming more overloaded, and I’m using Evernote to help out with that some (the article mentions TheBrain). It is a tough hill to climb.