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Willie Nelson describes the first time he ever performed

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PBS News Hour

Facebook’s psychological study ends up testing users’ trust

Many Facebook users were upset by news that the social media network manipulated incoming content for hundreds of thousands of people without telling them. The manipulation was conduction for a study -- published in a respected scientific journal -- measuring how attitudes were affected by either positive or negative posts. Judy Woodruff learns more from Reed Albergotti of The Wall Street Journal.
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