Join a club or volunteer. Visit expositions and talk with some people after.
If you go to school or work, you might start talking tothe people there.
Say: "Hi, I'm whoever, I don't know many people/anybody here..."
Well, I've only a few friends that I met through the Internet, though.
One is a guy that bother me but is still my friend and we meet sometimes IRL. The other is a girl and I can share a lot of things with her, we lived very similar things, and I've never seen her in real life though we talked over the phone. Then I've some other friends, I guess.
Read blogs and comment, that's how I made another online friend. Join a penpal program if it's your thing.