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EDIT:
Oh, you must be talking about this: https://www.exophase.com/account/#social
It doesn't seem to exist for RetroAchievements, I guess because there is no need since it wouldn't add any features.
RA doesn't have any sort of external login system we can use to verify accounts, so this hasn't been implemented yet. Will look into alternative methods though, they do have a motto field we could use to have you enter in a code similar to how we verify PSN accounts.