This is NPR's Book of the Day. I'm Glenn Weldon. To be a whistleblower is more than an act of individual courage, though it certainly is that.

It's also a rejection of one's own complicity in the status quo. It's an act of radical hope, a belief in the future, and in the possibility that systems can change for the better.

What drives someone to make

such a lonely, risky, life-changing decision? Francis Howgan knows she was a Facebook employee

who went public with her claim that the social media company had changed what its users

saw in ways that drove and rewarded misinformation and that ignited violence.

In her new book, The Power of One, How I Found the Strength to Tell the Truth,

and Why I Blew the Whistle on Facebook,

she details the life experiences that turned her into someone with the moral clarity

to call out the harm she saw at work every day.

She talked to host Robin Young of NPR's Here and Now.

In the U.S., national security news can feel far away from daily life.

Distant wars, murky conflicts, diplomacy behind closed doors.

On our new show, Sources and Methods, NPR reporters on the ground bring you stories of real people

helping you understand why distant events matter here at home. Listen to sources and methods on the NPR app

or wherever you get your podcasts. Francis Hogan is the Facebook whistleblower who used more than

20,000 pages of documents, to back her claim that the

world's biggest social media company knew it had changed its algorithms to reward extremism,

refused to fix it, even as Facebook was being used to ignite violence and spread lies,

ignored their own research on children's mental health, and at some points blame the users themselves.

This has all been widely reported. She sat in the First Lady's box in January's State of the Union

to receive applause and thanks for stepping forward. But likely you don't know how Frances found the

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