FB is really great about making you feel guilty if you delete the app, don't use the app. You miss your friends, they miss you, you don't get all the news, you feel out of the loop, you are lonely again.
Deactivated (not deleted) my account a couple weeks ago. Guess what? Life goes on. Nothing happened. I am still in the loop and I spare a couple minutes per day. Gained a bit more freedom, at least it does feel like it.