I have 5 Steam friends. They were all linked in when I had a Facebook profile except for one who's a work friend. None of them have been online in the past 250 days except for the work friend and one nut who makes people who wear diapers to game seem sane. I haven't talked to him since High School.
Most of my real life friends have been PC gamers primarily all their lives so they have old Steam join dates like me though I've only been a MAC/PC gamer for half the time they have as I couldn't afford really nice rigs.
The other half of my friends is are gaming buddies I met in a community while playing online on the 360 and then met them in real life at conventions like PAX.