The Vintage Star Wars Collectors blog has put together a Q&A with four forum admins/moderators including myself. Some good discussion on the pros and cons of both forums and Facebook. Check it out here:
http://vintagestarwarscollectors.com/vintage-star-wars-moderator-roundtable-forums-and-the-future/
http://vintagestarwarscollectors.com/vintage-star-wars-moderator-roundtable-forums-and-the-future/