Quoting she nan igans:" Okay, stupid question. For those of you who have friends you did NOT meet in school (or grow up with) ... [snip!] ... ever see those people again? I told my husband I needed "Be my friend" business cards to hand out to perspective friends. lol"
I've made friends as an adult playing sports, at work, co-workers of my husband's, bandmates of my husband, playgroups, playgrounds, classmates of my daughter and friends of friends. I do live in the city that I grew up in, so that makes things easier too (I still have friends from high school and some of my friends from university live in this city too).
I'm not good at making friends though. I really find that sports make things easier. When we do have friends over, we usually eat and/or play games (board or video) or go out to dinner and bowl or skate or see a band.