Go for it if it's important to you. I've tracked down old friends, and we chat once in a while online. But friends change, people change. I, for one, am freakin' terrible at keeping in touch with people. Facebook and texting have helped with that, but you'd have to hold a gun to my head to get me to sit down and write a letter.
I have friends across the country. I don't talk to them often, but they're still friends. We're all just bad at keeping in touch.