I've met 50+ people through a psychedelic website at gatherings... definitely a great way to meet really cool people... just be careful, as april said. It's best to really get to know someone on line first and get a strong rapport going before you even risk a face to face.
Kinda related but not this site again: Two of my very best friends in the whole world were made over the internet. We met at a gathering, hit it off so well, they moved up to live near my girl and me. They eventually moved back and we spent some time living near them instead! Now we live like 2000 miles apart and we have a very strong bond that will never be broken.
One of the coolest thing about the internet is it allows you to connect with people who are really kindred spirits and share your vibes much more closely.. if you happen to find the right people anyway. I guess that can happen in local encounters too, but I'm a fucking weirdo, and there are not many people like me... so it took some hunting.
Just a nice story related to the concept of internet meetups.