Warning: This Article Is Educational YouTube thinks Dennis Prager’s videos may be dangerous.

http://www.wsj.com/articles/warning-this-article-is-educational-1476918851

Tech giants like Google and Facebook always deny that their platforms favor some viewpoints over others, but then they don’t do much to avoid looking censorious. This week a conservative radio host and author is wondering why YouTube classifies his educational web clips as “potentially objectionable” material.

Dennis Prager’s “PragerU” puts out free short videos on subjects “important to understanding American values”—ranging from the high cost of higher education to the motivations of Islamic State. The channel has more than 130 million views, and the spots tend to include an expert guest and background animation. As you might guess, the mini-seminars do not include violence or sexual content.

But more than 15 videos are “restricted” on YouTube, a development PragerU announced this month. This means the clips don’t show up for those who have turned on filtering—say, a parent shielding their children from explicit videos. A YouTube spokesperson told us that the setting is optional and “based on algorithms that look at a number of factors, including community flagging on videos.” Yet it’s easy to imagine a flood of users reporting a political video—microagressed college students have a lot of free time—and limiting a viewpoint’s audience.

Here are some of the topics that are apparently too sensitive to learn about and discuss freely: Did Bush Lie About Iraq?; Israel’s Legal Founding; Why Did America Fight the Korean War?; Why Don’t Feminists Fight for Muslim Women? PragerU started a petition calling for YouTube to remove the restriction, and more than 66,000 people have signed.

YouTube is free to set its own standards, but the company is undercutting its claim to be a platform for “free expression.” If anyone there would like to brush up on the concept, Mr. Prager has a video about it.

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