From WNYC in New York, this is on the media.

Brooke Gladstone is away this week.

I'm Bob Garfield.

This was the week that Facebook got caught committing journalism?

Facebook says its users determine what topics are trending, but new claims suggest that may not be the case all the time.

Facebook's trending news section isn't actually determined by a computer algorithm, but by Facebook workers.

What's trending on Facebook? Liberalism.

The tech site Gizmodo, based on whistleblower testimony, reported that the world's largest

social platform has been manipulating its supposedly algorithmically generated

trending story feature with human intervention, either to make up for the tin ear of computer code or to

inject political bias or both.

According to one of our sources, conservative news was suppressed regularly.

Michael Nunez broke the story for Gizmodo.

This particular curator kept a running list for the course of six months because he

felt so uncomfortable with how frequently conservative news topics were being blacklisted.

Another revelation that we discovered was that these curators are using something called

an injection tool. And in those cases, they're plugging news stories into Facebook's trending news

that aren't naturally trending at all. Facebook this week categorically denied using

curators to advance an anti-conservative agenda, but it also denied having a so-called

injection tool. And then the Guardian newspaper released leaked Facebook documents,

instructing curators on such a tool's use. So at a minimum, the company has some serious

explaining to do. The question is, how much, and to whom? Republican Senator John Thune of

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