Personally never tried buying anything on Facebook. Deactivated my Facebook back in September and couldn’t be happier.
I’ve bought multiple parts at decent prices and even two sets of wheels and tires for my 2014 on SVTPerformance. The Fox Body parts market seems pretty dead over there though, unfortunately.
I’ve had mixed luck with craigslist but I would also suggest checking out the apps LetGo and OfferUp. I found my fox on OfferUp and have seen a few people selling parts on both apps.
I deleted my original account and it definitely made my life more peaceful. Unfortunately because of craigslist dying off, I've had to to create a burner account to use the marketplace.