If you have an account with a web service like Facebook, flickr, Google, LinkedIn, Sina Weibo, or Twitter, you can add it to your Microsoft account
. This connects the two accounts and allows information you choose to be shared between them so you can use it in your apps and other places where you sign in with your Microsoft account.
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 add or remove your web service accounts
(ex: Facebook) in your Microsoft account
to be able to share information between them.