Facebook counts the number of monthly active users on their site in the billions. With all the activity from friends, pages, groups and so on, it is easy to spend several minutes a day on Facebook. These minutes pile up quickly resulting in you spending an inordinate amount of time surfing through stuff on the Facebook news feed that you might even regard as totally irrelevant.
I find myself in the same boat often. I cannot just quit Facebook as I do have many good friends here, am admin of a few pages and a member of some really awesome groups. How do I manage my time and make sure I just get the relevant updates?
The way to go is to filter out any content that I deemed unnecessary from my news feed. If you find yourself in this situation often, there are a few things you can do to increase your productivity (Does it really apply in this context?) on Facebook.