Facebook made $29 billion last quarter which translates to $315,217,391 per day. Divide that over 24 hours in a day, and it's ~$13 million per hour. Of course,

Facebook made $29 billion last quarter which translates to $315,217,391 per day. Divide that over 24 hours in a day, and it's ~$13 million per hour. Of course, depends on the hour of day. Facebook likely makes more ad money when North America is awake than when Asia is awake for instance.