How do you feel about being "found" by an old friend through an internet search?

I was just thinking about an old college friend I haven’t talked to in years (don’t have his phone # or email). I googled his name, and found him on linkedin. I don’t have a linkedin account, and I feel very weird joining just to say hi to him, but I really want to say reconnect.

Do you feel weird “finding” people on the internet? Is it acceptable behavior these days with all the social networking sites out there? When is it ok to do, and when is it border-line stalking/crazy-person behavior? Are you happy when people “find” you like this?