Cathy O'Neil, Columnist

Facebook Could Do a Lot More on Trump-Russia

The company could probably measure the effect of election-meddling if it wanted to.

Did it work?

Photographer: Andrew Harrer/Bloomberg

The world now knows, thanks to Facebook’s disclosures, that Russians bought a lot of ads in an effort to influence the outcome of the 2016 presidential election. But that still leaves the more important question: Did they succeed?

I think Facebook could do a lot more to find an answer.