Talk to people

You can join a club, go to school, or go to church but you still won't make friends if you don't actually talk to people. By the same token, you don't have to be involved with an organization to be social, and any time you talk to someone, you have a chance at making a lasting friend. You can talk to anybody: the clerk at the video store, the person sitting next to you on the bus, or the person in front of you in the lunch line. Don't be too picky. Most conversations will be a dead-end of sorts, when you may never talk to that person again, or you just remain acquaintances--but once in a while you'll actually make a friend.