Mitubati
A person from my old school that always glared at me like I was the scum of the earth and never talked to me added me on Facebook and I have no idea why. I believe some people can be rather "I don't give a ********" when it comes to which friends they add. I usually just add or accept certain people because I'd like to know what's going on in their lives.
That or she still thinks you are the scum of all earth and needed to be reassured by adding you on facebook to view all of you recent scumish photographs, and sit and scoff at your face.
All because she is probably jealous of a certain quality you have- that she does not