If you previously connected a Facebook page to a broadcaster and have noticed post likes are no longer appearing in your activity stream, a Facebook authentication problem is most likely the cause. You can solve this by simply disconnecting and then reconnecting the Facebook page.
To do this, click on Messages and select the broadcaster whose Facebook page the problem relates to. Then click Settings > Facebook and click Disconnect Facebook page. Next, re-select the Facebook page. Within a short amount of time, new post likes should begin appearing in the activity stream.