Meet one of the Internet's most prolific distributors of hyper-partisan fare. From California, Cyrus Massoumi caters to both liberals and conservatives, serving up political grist through various Facebook pages. Science correspondent Miles O'Brien profiles a leading purveyor of junk news…

Facebook founder and CEO Mark Zuckerberg finished his visit to Capitol Hill with another long hearing Wednesday. After two days, do we have a better understanding of how the social media giant gathers data? Science correspondent Miles O'Brien joins Amna…

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