1. That look where only you and your best friend know what you are talking about; Damn, i guess besties are psychic like that
2. He/she knows your stalker side and the exact number of social sites you have stalked someone on.
3. Stalk each other on social media and then grill them on how they hang out with others beside you. Jealous much?
4. Those awkward pictures and plethora of selfies that no one has ever seen. Do you think I look fat?
5. You share the same amount of hatred for a common frenemy
6. You first kiss. And every detail of those other flings!
7. Your evil streak. They know what you are up to when you are being too sweet to your ex.