Personally - and not wearing my Chairman's hat here - I avoid Facebook like the plague not only as yet another thing to eat into my time, but also because I would not like Facebook members to have access to my personal data, knowing that Facebook has had privacy issues in the past. Moreover, it seems to open the door to more junk email. On the other hand, because I don't use Facebook, I may be wrong about all this.
However, I see no good reason for proselytising. It's not difficult for anyone interested in junk rig to find us. Google "junk rig" and we are at the top of the page. "Chinese Sailing Rig" and we are on the first page. "Fully battened lug rig" and we are there, too. The Internet makes a huge amount of material readily available to anyone with the slightest curiosity and minimal computer skills. If one of our members can set up a Facebook link that will also ensure we retain our privacy and won't subject our website to unpleasant attention, then I believe they have a right to submit a well-considered submission on the matter. Otherwise, I - again personally - believe it to be irrelevant to our Association.