9. They Like Everything On Your Social Media Accounts
You can guarantee that your best friend will completely troll your profile on social media accounts. So every time you post a status or upload a picture, you can be certain that at least one person will always like it. When you're bored you'll probably look at her profile just to see what's going on, as if she hasn't told you everything anyway. And when someone who you don't know writes on their wall calling them a besto, you are immediately on the phone to her demanding to know why she is such a slut.