After 5 years of sobriety I have lost a whole social world. Without the bong and the fridge full of beer there just isn't that much reason for many of my old friends to come and visit me anymore. Maybe I'm just being naive but I don't think that all of them made a conscious decision to do this, it just organically happened. It wasn't that fun to hang out with drunk people when I wasn't a drinker. I suppose the feeling was mutual.