Soldato
Facebook (and all social media apps) are crap. Your life is greatly enhanced by not using any of them
Facebook groups are incredibly useful for finding information about virtually anything. Forums used to be great but many are dying as so many people have moved onto facebook groups or just lost interest in general.
Case in point - if I have a question regarding a particular car and post on a forum for that marque, I may get 3-4 replies over a week. If I post on the Facebook group for that particular model of car, I'll generally get 20+ replies in a few hours and almost immediately have the issue solved.
Facebook marketplace is far better than ebay or similar sites as well, I've got some great deals over the years and have sold lots of stuff too.