Until recently I frequented RPGnet. A lot (14K+ posts worth). Mainly their Tangency forum. I've made a lot of connections with folks that were more than your average on-line friendships. Last year, a couple of us organized a gift for someone. Took up donations and sent it to him out of the blue. It felt good.
Then, a few days later, we got word that one of "our" gals had received some very scary news. She'd found a lump in her breast. Twenty five years old. No insurance. Husband unemployed. She was able to get it looked at and they determined it probably was benign, but removing it for a proper biopsy was still going to cost a couple hundred bucks they didn't have.
Seeing that money come together in less than twenty four hours felt even better. Getting to meet her face-to-face at Origins this year, along with a lot of other folks involved was best of all.
I firmly believe the Internet is slowly growing its own communities, not of physical proximity but of adjacent interests, ideas, and ideals. The number of game days and con gatherings I've seen and heard about is just the first steps on the road to something grander.
IMHO, of course, YMMV.