There is also:
Make sure that users don't have the option to connect to Facebook by using the steps that are described in Add Facebook friends as contacts. If users don't have the option to add their Facebook friends as contacts, you can safely ignore the error message.
Click on that link and you get:
Sorry, the page you’re looking for can’t be found.
You may have clicked an old link or the page may have moved.
Yeah, great MS. See icon.