When you use any computer or unsecured wifi connection outside your personal one to login to your social media account(s), make sure that you sign out. That one simple click can make a big difference, especially if your account has important information. Plus, it just helps you keep what is private, private.
I have known people who have forgot to sign out of their social media account, and someone came along and hijacked it. I have also had a friend forget to sign out at school and someone spread some secret information about them that came from their account's messages. Not only could this happen at school but even at work.
So, everyone just make sure you sign out. It can be a life saver.