FAQ - Why can I not see any Facebook friends online on my Nokia Lumia phone?

You may find that your first sign-in to connect to the Facebook network. This occurs because Facebook chat is enabled through the cloud proxy for your primary Microsoft Account ID. It can take Microsoft Account some time to aggregate and pull in the Facebook friends through the connected service. Usually, this process is complete within 30 minutes. After 30 minutes, the Facebook friends should show as available in the Messaging > Online screen.