Its not so much the GMTN FB group, but the Trailblazer, Envoy, etc Fan FB page. The FB page was started by someone who is not affiliated with this forum. That FB page receives way more traffic than the GMTN FB page, I assume because many people do not know what a GMT is. The other FB will come up when searching any of the GMT360 models. Most of the questions that are posted there have been cover by threads that are already started here or could be better answered by starting a thread here.
I think the thought process behind creating a GMTN FB page was to get the word out about this forum and not to be used as a way of posting technical questions. After being apart of either group for a while, you will start to see the same questions over and over. All of the information is lost after a couple weeks. You cannot search the FB for help like you can a forum.
I think that both FB pages are better suited for posts like you would see in "What did you do to your GMT today thread".
On the other hand, there are WAY more ACTIVE members on the FB groups than here on the forum. The appeal is greater to be able to make a post and have it be seen by a couple hundred people in a matter of seconds versus waiting for responses on a forum or even taking the time to search. Personally, I receive notifications on my phone when someone makes a new post on either one of the FB pages, so I see the questions almost instantly.
FB posts seems to be the #1 go-to research resource for the younger generation. Hell, even a simple Google search would answer their questions and save time from posting on FB.
For the most part, anyone asking for help, receives help. If the technical questions get too in-depth, need wiring diagrams, pictures, part numbers, etc, most of us will direct them to this forum.