Configuration for Facebook authentication in Sitecore 9

FacebookIdentityProvider.config

<?xml version="1.0" encoding="utf-8"?>
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/" xmlns:role="http://www.sitecore.net/xmlconfig/role/">
  <sitecore>
    <federatedAuthentication>
      <identityProviders>
        <identityProvider id="Facebook" type="Sitecore.Owin.Authentication.Configuration.DefaultIdentityProvider, Sitecore.Owin.Authentication">
          <param desc="name">$(id)</param>
          <param desc="domainManager" type="Sitecore.Abstractions.BaseDomainManager" resolve="true" />
          <caption>Login with Facebook</caption>
		      <icon>/sitecore/shell/themes/standard/Images/24x24/facebook.png</icon>
          <domain>sitecore</domain>
          <transformations hint="list:AddTransformation">
          </transformations>
        </identityProvider>
      </identityProviders>
      <identityProvidersPerSites>
        <mapEntry name="Facebook" type="Sitecore.Owin.Authentication.Collections.IdentityProvidersPerSitesMapEntry, Sitecore.Owin.Authentication">
          <sites hint="list">
            <site>shell</site>
            <site>login</site>
            <site>admin</site>
            <site>service</site>
            <site>modules_shell</site>
            <site>modules_website</site>
            <site>website</site>
            <site>scheduler</site>
            <site>system</site>
            <site>publisher</site>
          </sites>
          <identityProviders hint="list:AddIdentityProvider">
            <identityProvider ref="federatedAuthentication/identityProviders/identityProvider[@id='Facebook']" />
          </identityProviders>
          <externalUserBuilder type="Sitecore.Owin.Authentication.Services.DefaultExternalUserBuilder, Sitecore.Owin.Authentication">
            <param desc="isPersistentUser">true</param>
          </externalUserBuilder>
        </mapEntry>
      </identityProvidersPerSites>
      <propertyInitializer type="Sitecore.Owin.Authentication.Services.PropertyInitializer, Sitecore.Owin.Authentication">
        <maps hint="list">
          <map name="facebookadmin" type="Sitecore.Owin.Authentication.Services.DefaultClaimToPropertyMapper, Sitecore.Owin.Authentication">
            <data hint="raw:AddData">
              <source name="idp" value="Facebook" />
              <target name="IsAdministrator" value="true" />
            </data>
          </map>
        </maps>
      </propertyInitializer>
    </federatedAuthentication>
  </sitecore>
</configuration>