r/place was this years April Fools' Day social experiment that Reddit launches yearly. To sum it up, it was basically a giant collaborative online drawing that everyone could see in live action, where each user could place a single pixel anywhere and in any color on a digital "canvas", before being given a 5-10 minute cool down before they could place another one. The general idea was that everyone could work together to make artwork (or just vandalize the place).
Final version of /r/place
https://www.reddit.com/place
https://www.reddit.com/r/place/
