Short of an online book, forums work 'okay'. There is tons of info on this site, but like any forum, info gets pushed further back in the line as time goes on. 'Stickys' help, keeping the most useful topics at the top of the post list.
The search function here works much better than most other sites.
I have trouble with Facebook.... there is no organization, no categories, just a timeline full of haphazard comments. Can you even search for anything? I simply don't use it.
I tend to keep my own notes. If there is a useful bit of info in a post, I simply copy/paste and save it in a Notepad file that may simply be titled (for example) 'Transmission'. I end up with a document that is composed of one-liners of useful info. I try to include the posters name (for credit) and a link if there is additional info to be found in the original post.
We could add another section to the site composed of articles. It would likely be the same info in the forums but organized in a different manner. It would take considerable time to compose. Would it be worthwhile?
One of the more notable sites in the history of online Buicks is Georges site at:
http://buickperformanceclub.com/Not a forum, primarily articles, and lots of great info.