Some may be interested in the poll-driven play-by-forum we're doing at board game geek. I've just started the latest, Hunt for Gollum.
https://boardgamegeek.com/thread/2408795/crowdsourcing-hunt-gollum
There's an announcement thread here for these quests:
https://boardgamegeek.com/thread/2408796/crowdsourcing-play-forum-announcement-thread