I don't use G+, I am in some coder groups on Facebook, but I personally prefer a proper forum (Sure this one can use some work, but I'm working on that).
I'm against using a G+, Facebook or other social media website as the main forum for Nim.
In fact there is a Nim community in G+:
https://plus.google.com/communities/106921341535068810587
...and this was posted in May 2015.
http://forum.nim-lang.org/t/1210#7483
[]s Felipe Mamud