Like Tim said, I don't think there alot you can do to solve the problem. Maybe some way you can link the 2 so people fb build threads, questions and general discussion along with parts for sale all interact with the forum. I'm not sure if thats possible. Myself I don't have Facebook so I do miss out on whatever goes on I've always fancied like a glanza/gt registary so you can track who's owned it and whats been done to it. I'm sure some the classic car groups do that