The Washington Post takes a look at some web -based ways to meet friends and go do stuff. I’ve never engaged in any formal online activities explicitly oriented around friend-making, but I do owe several of my friends to the quasi-social online activity known as blogging, and when you add in friends of friends in various degrees, blogging is probably the biggest avenue through which I know anyone.
This is, I think, an under-recognized aspect of the internet. Since typing away is a solitary activity, time spent on the web is often conceptualized as a substitute for interacting with people. More realistically, though, the internet actually substantially decreases the search costs associated with getting to know people and facilities meatspace interactions.