Freaking out a bit

I was just checking in on my facebook page and noticed that one of my coworkers has updated her pictures. Now, I know that this particular coworker and I have lots of acquaintances in common. She went to elementary school at a feeder school for my high school. I thought I knew all the people we had in common, though. So, I was not prepared for the shock when I saw the one friend we share on facebook - the person from whom I was inseparable between the beginning of 10th grade and about halfway through senior year. I'm still freaked out. I can't wait to ask my colleague about this tomorrow. I wish I could call her right now.