Facebook is a very valuable site. Some of the things you can do include...
-Wildly exaggerate the awesomeness that is your life and seek much needed affirmation.
-Wildly exaggerate the tragedy that is your life and seek much needed pity.
-Post pictures of your children on the hour instead of cooking your old man a decent dinner.
-Lip off to people like you're the biggest bada$$ on the planet.
-Prove you're patriotic and charitable without having to actually do anything of substance (ice bucket challenge?).
-Keep tabs on your ex's to make sure they are at least as fat and miserable as you are.
-Avoid real communication with relatives you'd never pick up the phone to call anyway.
-Be disappointed daily that the people you actually like and want to hear from don't post anything to facebook.
I quit almost three years ago. I'm 33, and none of my friends use it anymore. Obama and the NSA are going to have to work harder to find out how I feel about things.