… welcome to the Club Arnage Le Mans forum …
I asked DriveTribe why that was their policy as I didn't want link FB to to it. Their response? It's the way we authenticate users - we ain't changing - an they then advised me to set up an empty FB profile and log in using that. Odd.
I abhor Faceberk (and it's ilk) and, as this appears to be the only method by which you can currently sign in, it's not even an option for me.