I know everyone has their own opinion about Facebook and other forms of social media and everyone has their preference. Personally, I tend to prefer the Facebook format to email. I've joined this group there as well as a number of other car related groups.
In terms of finding stuff later, Facebook's search capability is actually quite good at finding past posts/conversations, but by default it searches across Facebook. You can then filter the search results to include only the Crosley group (it's this additional step that makes it hard to use, I think).
As you come across things that you think you'll want to find again later, FB has a "Save Post" feature that's very useful. You can categorize your saved items (e.g., I have a "Crosley" collection) and easily get back to them later.
I totally agree that one of the most frustrating "features" of Facebook is its insistence on never showing you the same thing twice. So, once you see something and it gets away, it can be really difficult to find again. :-/