If you’ve connected
your Microsoft account to another web service account like Facebook, flickr, Google, LinkedIn, Sina Weibo, or Twitter, you can choose what information you want to be shared between the two accounts.
For example, if you connect a Facebook account, you can choose to show info like your Facebook contacts' email addresses and birthdays in Windows RT 8.1 and Windows 8.1 apps like Mail, People, and Calendar.
This tutorial will show you how to change or review sharing settings
of web service accounts (ex: Facebook) you have added
to your Microsoft account
to choose what info you want to share between them.