For the heck of it, I've created a Mouse Gestures community on Google+.
It's not specific to S+, just about mouse gestures in general. I set it up to require approval to join, simply because I've seen many other G+ communities get swamped with spam.
I will join your community the minute I join G+! Google wants me to sign up for G+ in order to post reviews in the Play store, so it may happen in the near future (although I'm currently still in my "annoyed with Google" phase because of that, after just having got out of my previous phase of the same, which was before verbatim search became possible—although I still desperately want punctuation search).