Hello guys,
I was also facing the same issue on my Lumia 620. I have fixed the issue now. To fix this, check your Facebook settings from your PC and you will find application 'Microsoft'. Click on that and change the access to 'Friends'. In my case, it was set to 'Only Me'. After that, click on Microsoft (application name as it will be a hyperlink) and you will be prompted to login using your Microsoft ID. Now, connect your facebook and Microsoft ID and make sure, you have checked the correct permissions. In my case, I had both accounts connected but 'See Facebook profile and friends updates' was unchecked. Check all the checkboxes that you need and you are done!
Hope this will fix the issue for you.