I'm choosing not to use OAuth or any of the other social API abstractions out there because 1) they are all very complicated and 2) the ones that worked didn't have all the services we need and 3) all of these social sites now provide really nice API's themselves so creating our own strategies/drivers is very simple given the very simple task we need to do and that we already have an access token.
validateToken()
— Checks with the site to confirm that the given token is indeed valid and corresponds with the userID we were given. It can do anything else it needs as well (e.g. facebook provides a debug_token endpoint)