Childhood Best Friend Dilemma

I'm so stuck. What do you do when you find an old childhood best friend online? Do you just like type to her saying "hi! Remember me from like 10 years ago?" What if you just found out her mom died? Do you say sorry to her online? Is it stalking if you look at her tumblr alot because you just so badly want to see her or remind yourself of her or you feel like you can relate to her so well, or something? I know this problem isn't half as hard as other people's but LIFE IS SO HARD!