I think it's technically approvable when I say computer games. Most of the times it's no communication, or it's conflicts and lots of noise. But then you come across some servers with a good atmosphere, which can even provide some humour. Then you have other games where you stick with the same group a little longer, and in maybe just an hour you've helped each other out, been discussing and might have accomplished a brief friendship, before they disappear out in the cyber space. Behind every computer screen is a person whom you would never have met in real life.
Other than that, it's hard to figure out something else. Public events quickly becomes intense and crowded. But maybe we're not discussing things like that?