This exact thing bugs the crap out of me and has since Spring Social began. Do I sync up with what the OAuth specs call it (and they differ between specs)? Do I sync up with what each individual provider calls it? Do I pick one and use it across the board no matter what the provider or any specific version of the spec says? I don't know.
At one time, I settled on calling it whatever the provider called it. But then the providers started changing their minds (Facebook, especially). Now I'm inclined to sync up with the OAuth specs, which are less likely to change. Even so, the names will be different between OAuth 1 and OAuth 2.
Even so, and even though this has bugged me...it hasn't bubbled up as a high priority and that's why I've not bothered changing them.
Spring Social Project Lead