I work in a Call centre with about 250 people. I share my beer with a few of them (anyone who's keen, actually), and have encouraged a few brewers to start/ restart/ explore. Some of their partners brew and I have been able to share their beer and pass my beer on to them, too.
I have a few converts to my doctrine of weizen, and continue to chip away at their macro-beer tunnel vision.
I have introduced dozens of people to quality beer at Friday arvo get-togethers (Goat, Squire, Coopers, Belgians and my HB: weizen, Wit, pale, etc).
If people give me quality empty bottles, I usually return 1/2 of them (or equiv volume) full of HB, as an incentive.
According BYO magazine, I may be a beer evangelist.