I think Facebook groups are a mixed bag. Part of the problem is structural. They really don’t have a good forum/thread structure which makes finding information and following conversations more difficult. In the fruit tree related groups there are some highly knowledgeable people but you seem to need to sift thru quite a bit of bad advice to find them.
I recommend this forum to people in general if they have an interest in growing fruit. But I could see an influx of people from Facebook could make the moderators work load increase. I remember not too long ago the forum picked up a very abrasive, combative new member… they were banned in less than a week after multiple warnings. Actually I think ribs1 you gave one of the warnings. If we get an influx of people from Facebook hopefully that won’t be what we mainly get.
edit
Ah, here is one of the combative member’s threads and you did warn them ribs1.