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Rep. McKinley and Mark Zuckerberg on Facebook's pharmacy ads

Facebook CEO Mark Zuckerberg testifies on Facebook users' data before a House committee. Find more from PBS NewsHour at https://www.pbs.org/newshour Subscribe to our YouTube channel: http://www.youtube.com/pbsnewshour Follow us on Facebook: http://www.pbs.org/newshour Follow us on Twitter: http://www.twitter.com/newshour Find us on Instagram: http://www.instagram.com/newshour Find us on Snapchat: @pbsnews Subscribe to PBS NewsHour podcasts: https://www.pbs.org/newshour/podcasts Subscribe to our email newsletters: https://www.pbs.org/newshour/subscribe

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