New and improved two-factor lockout recovery process
Starting January 31, 2017, the Delegated Account Recovery feature will let you associate your GitHub account with your Facebook account, giving you a way back into GitHub in certain two-factor…

Source: The GitHub Blog
Starting January 31, 2017, the Delegated Account Recovery feature will let you associate your GitHub account with your Facebook account, giving you a way back into GitHub in certain two-factor…