First found Ag via an ad on FaceBook when it first launched. Not sure what you mean by "work". It's a social site that is mostly free of religious BS. In that sense, it works. As to therefore also being a site of openmindedness, intelligence, and tolerance... not so much. Those seem to be decreasing as membership increases.
I saw ads on FB...and learned how to post them there myself.
Accident. I was googling atheist something..don't remember now and this site came up.