The full name of the FaceBook a-frame group is "A Frame Campers (Aliner, Chalet, Rockwood/Flagstaff A-Frame)", so if you're already a FaceBook user just paste all or most of that name in the search box. There are several camper groups on FaceBook so it's possible to get the wrong search result if you don't enter the exact name.
As others have pointed out, it's not brand specific. I suppose when the new Jayco aframe gets more well known there will be five brands represented there. Currently there are 480 members. You have to ask to join the group, which is only to keep spammers out. If you mention that you have or are considering an A-frame you won't have any problem getting in. It's a very polite and helpful group. Hope to see you there as well as here!
It's never too late to have a happy childhood!
Lee, WU0V, and Courtenay, N0ZDT
2011 Rockwood A128
2000 Silverado 1500 pickup
60W solar system
2000W inverter generator