How to make best use of internet?

[Conow]

I think I've been wasting internet. So far, I've only played online games and checked youtube videos but internet doesn't seem to have done me truly productive so far. My fault, of course.

So suggest me some activities I can do via internet, please!! Here are some criteria.

1. It should involve communicating with people. It would be great if these communication be a long-term thing, but I just would love to speak to people around the world. I live in Korea, so I don't exactly have much chance to talk to people other than fellow Koreans. I would be pleasantly surprised if I would be able to add some interesting foreign names to my contact, too. Who knows what would happen later in my life?

2. I am a academically successful person. I am in a medical school, so you can assume I am within top 1% at South Korea in academic achievement. But here's the thing, that's the only thing I have been able to accomplish so far. Nothing else, I just did my studies real good. So it would be great if it involves making best use of my only talent. Or help me find new talents.

3. Must be fun.

4. Doesn't require full-time attention, like one of those obnoxious web-based games where you have to check every couple of hours whether you have been attacked or not.
It doesn't necessarily have to satisfy my criteria. If you have something real good, just tell me, please!