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This presidential election year has tested the limits of free speech on Twitter. It's a prime political platform for Republican candidate Donald Trump, for the correspondents covering both presidential candidates, and for the purveyors of hate speech.

Emily Bell is the director for the Tow Center for Digital Journalism at the Columbia Journalism School. NPR's Steve Inskeep talked with Bell about the challenges Twitter faces.


Interview Highlights

On the quality of debate on Twitter

Cori Bargmann's new job description includes "to help cure, prevent or manage all diseases by the end of the century." That's quite a lofty goal.

Bargmann is a neuroscientist and president of science for the Chan Zuckerberg Initiative, the joint venture of pediatrician Priscilla Chan and Facebook co-founder Mark Zuckerberg. The couple pledged $3 billion to solve major medical problems by helping scientists and engineers collaborate long term, over 25, 50, even 80 years.

In case you needed more evidence of the toll this divisive campaign is taking on America, a new survey says more than a third of social media users are "worn out" by the amount of political content they encounter.

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