It's a shame, really. Unless I'm mistaken, it's nearly impossible to go searching through Facebook posts by keywords, by dates, and by members. Sure, it's good for a quick answer to a question, but all that great, technical information is just going to get lost in the garbage. We've had some great discussions, with answers by top-notch engine builders, all with photos and write-ups, searchable by keywords and dates. And as long as we don't experience a server crash, it will continue to live here forever.
I can pull up some really great, informative threads from five and ten years ago. Try doing that on Facebook.