So glad you have found some sort of a community here. I haven't as yet. So your tips as to the #childfree community on here would be helpful.
There are many childfree facebook groups, just pop childfree in to the search. I don't use facebook much so can't really give much more.
I have an account ChildFreeBC which is really active.
Have a look at some of the folk I follow on there as it's all really positive childfree accounts that showcase and lead positive lives and dispel the BS that comes with being childfree.
Childfree By Choice by Amy Blackstone
Childfree Happily Ever After by Tanya Williams
The Baby Matrix by Laura Carrol
Your Children Are Boring by Tom James
The Are Kids for Me
The Honest Uproar
The End of the Line (very different and amazing)
I hope this helps. I am due to write a comprehensive story on here about some good resources.