In a 2009 book about the social consequences of the Internet, The Age of the Infovore, the economist and blogger Tyler Cowen argues that new technologies enable us to decide what information to consume and, as a result, to remake ourselves. Instead of reading the same newspaper or watching the same television news, we can ...

What exactly was the extent of Russian meddling in the 2016 election campaign? How widespread was its infiltration of social media? And how much influence did its propaganda have on public opinion and voter behavior? Scholars are only now starting to tackle those questions. But to answer them, academics need data — and getting that ...