https://support.office.com/en-us/article/Facebook-Connect-is-no-longer-available-f31c8107-7b5a-4e3d-8a22-e506dacb6db6 [support.office.com]

Facebook Connect is no longer available

Facebook has made an update to their Graph API that will impact Microsoft apps and services. Facebook’s Graph API is the tool that we use to connect your Microsoft account to Facebook. It brings contact information from your Facebook friends into Outlook.com and the Windows People app, keeps those contacts up-to-date, and provides options in apps and services like Photo Gallery, Movie Maker, and OneDrive.com to share to Facebook. We collectively refer to these features as Facebook Connect.

Due to these changes, Facebook Connect features will no longer be supported.