IF YOU ARE HAVING TROUBLE CONNECTING FB WITH YOUR REVIEWRAIL ACCOUNT, CONTACT SUPPORT AND WE WILL HELP OUT. LET US KNOW WHAT YOUR FACEBOOK LOGIN EMAIL IS AND WE’LL GET YOU FIXED UP.
You can log in to ReviewRail with your Facebook account. Your FB login email must be the same email as your RR account login. In FB it must be set at the primary email.
FB support doc: https://www.facebook.com/help/162801153783275