[macintux]

If you haven't already found the discussion, Reddit is very active and very helpful. Seems to be the primary water cooler for the event.

https://www.reddit.com/r/adventofcode/

[valec]

I'd argue /g/ on 4chan is actually. 3-4 threads get filled a day (~300 replies each).

It's honestly the only real reason to go on /g/ (or really 4chan in general) for me.