If anyone knows the secret to building a vibrant and unpredictable community, it must be Christopher Poole. He founded 4chan, a breeding ground for lively discussion, animated GIFS, and political coups that provided a simple, organized way to harness the best and worst of the internet simultaneously. Poole is now the CEO of Canvas, a start-up that encourages users to share and riff on posted images as a form of communal discourse. Call it Memes With Friends. Not wishing to be bound to the web, the team developed an app called DrawQuest, a “free drawing community” with daily challenges and…