I'm, aware of the Facebook forum search function (I use it a fair amount to find stuff for my antique truck n a model specific group). A forum is just so much more organized - easy to narrow in on a subject, or to browse in a specific area. As you implied, it makes a better "file cabinet". It also seems here is less "fluff": not as much unrelated stuff, and in a well run one, people don't tend to drift off into the political BS.