On reddit the spot was /r/roasting, but if/when someone wants to create a forum here I'd suggest calling it CoffeeRoasting to make it easier to find.

I've been looking for this as well since a few days without luck...

@tsl @mifilmi @AMillionMonkeys

I created https://kbin.social/m/CoffeeRoasting and I'll work on getting it set up with tags, etc.

None that I know, at least not in this instance. Maybe other instances? Or you can make one if you like.