Several of my friends and family are on Facebook. I have created an account but do not update it. I believe my reasons are all too common...mainly, I am too busy. I work, have a family to keep up and running and all the extra time-consumers of life. I am on the computer most of the day and when I go home updating Facebook would be a low priority.
Maybe, as more of those I know are on I will try to find the time. It is even hard for me to monitor my personal email account. Sorry, but this is my current life. I am thankful that I do have so many things calling for my time though.