Dear roommate from last year,
I'm ... confused. While living together, we never spoke. It was like living with a ghost that would probably get offended if I had sex while you were in the room. By the end of the year, I was convinced you HATED me with a passion. However, 6 months after we moved out of the dorm, after not having seen each other since, you added me as a friend on Facebook.
I mean that's cool. But ... WHAT? I confirmed. To be nice. But does this mean we're going to talk? Probably not.