What should I do? Apologize? Let it go?

I got rid of my facebook (myspace) a week ago without telling my friends at school, who were really excited and happy that I decided to get one. Now they seem po'ed at me. Should I have said something? I thought about it but I onestly thought it would be arrogant of me to think they cared that much. I don;t know though they seemed po'ed before this, I wonder if they thought I was arrogant because I added a lot of friends. I guess I could either apologize, put it back up, act like nothing happen, let it fade away. I honestly thought they would figure out that I got rid of it and they never asked me. The screwy thing is I'm trying to get to become better friends with these people and I don't know if this screws it up. I also have incredibly low self esteem and social anxiety disorder so I guess I could be misinterpreting anger, like I do a lot, but now they have reason to be pis sed