This story surprised a lot of people because Prager U. is not considered a fringe or radical group, just mainstream conservative.
(From The Daily Caller)
Facebook on Friday issued an apology to PragerU for “mistakenly” removing several videos and limiting the reach of others.
We mistakenly removed these videos and have restored them because they don’t break our standards. This will reverse any reduction in content distribution you’ve experienced. We’re very sorry and are continuing to look into what happened with your Page.