I run a DnD campaign. It started after I tried desperately to get my RL friends into a campaign because as we get older we spend less time with each other and it seemed like a good way to keep us meeting each other. I got a DM from my work and it was nearly ruinous, he was bad and they all wanted to quit and it made them all, including my wife hate dnd.
After we quit that game it took me a major amount of convincing to talk them all into playing again with me as the DM. And the first session was mostly a 'try it out' session. I got a different coworker to come play and he brought his girlfriend of one month to a new session. It introduced my wife, my best friend of twenty years, his wife, a good friend of mine from work and his girlfriend together. People who didn't know each other.
Since then we have become such a family in two years of this campaign. My best friend plays the cleric, and our other friends are getting married soon-ish. Last night at a party the two betrothed players went to our party cleric and asked him to officiate the wedding because they would rather no one else do it then their trusted cleric Yuri.(character name) It was the cutest damn thing in the whole world and it made my heart melt. These people became friends because of DnD and now one is officiating another's wedding. It's so sweet and I cried just a little.