I'm connected to a couple of them, but I don't like the format over there at all.
https://www.facebook.com/groups/VwCorradoChat/
https://www.facebook.com/groups/278350932289020/ (Corrado Classifieds)
https://www.facebook.com/groups/822112387910372/ (Corrado Classifieds)
I'd suggest that if you know anyone who wants to do a build thread on facebook, that the best format for that is to create a page for the car, then you can use that page to document things over time, and people can comment on the individual posts. At least you know they're not deleting your data, unlike photobucket ;)
I prefer forums.