Think of them a different versions of this forum, Roger.
Twitter is like micro-blogging, and I don't really use it, other that have my blog posts, and Facebook business page posts automatically tweet to it. It gets posts out to a wider audience, and means posts get more views, and followers.
This forum is like a house, with half a dozen rooms, each room being a section of the forum. "Outpourings" might be the bathroom, "Saloon Bar" could be the drawing room, etc. Facebook is a thousand times more intricate than that, and you tailor it to what you want to see, who you want to liaise with, etc.
For instance, you might want to "like" and "follow" Peter Noone and `herman's Hermits.
https://www.facebook.com/HermansHermitsStarringPeterNoone?fref=tsIf you do, their posts will show on your timeline.
Maybe you'll want to follow Dundee Utd Fans page -
https://www.facebook.com/DundeeUnitedFTD?nrHave Diane as one of your friends? "Like" her, and her musing will appear in your stream too.
https://www.facebook.com/diane.haskell?fref=tsLike Vincent Van Gogh? Have a flow of his brilliant artworks appear as and when posted:
https://www.facebook.com/vincentwillemvangogh?fref=tsEnjoy "Horace" -
https://www.facebook.com/amancalledhorace?fref=tsMaybe follow Bob Newhart too -
https://www.facebook.com/pages/Bob-Newhart/147547279204?fref=tsOr Andy Capp -
https://www.facebook.com/WorldofAndyCapp?fref=tsYou make it what it is.