In short, you're a friend of a friend of a friend. I've started to read my friends' friends lists since there is a lot you can learn about a person's personality by looking at who they communicate with. A friend of a friend intrigued me, and hadn't posted in a while, so I read her friends list (Petra Quince). I happened to notice "Mac" and "Problem" in the same post, so I thought I'd investigate.