Whether you realize it or not, FB changes your emotional health. FB used to make me oddly depressed. Its like sitting in front of the TV and feasting on Sour Patch Kids for two hours. I would sit there staring at how awesome people's lives were and wonder why I wasn't doing such awesome things myself. I heard about the passing of family members from family friends before family members would have a chance to tell me personally.
After I stopped going to FB my important friends started CALLING me. Can you believe that? They picked up the phone and CALLED me. I went out to dinner more. I stopped engaging in those destructive conversations like "Can you believe so-and-so's status message..."
There have been some drawbacks though. I don't always hear about last-minute parties. I don't get to see the pictures my friends take from events. And I don't have the luxury of sending a message to someone I don't quite know very well who wouldn't have my phone number or e-mail, most likely through group activities like Crossfit that I'm a member of.
But all things considered, ditching Facebook is highly recommended.