Who's in charge of protecting social media from election interference?

With less than 10 weeks until the US midterms, the passing of responsibility between companies and the government is leading to the uncomfortable conclusion that nobody has the full picture

When Facebook Inc.’s Sheryl Sandberg and Twitter Inc.’s Jack Dorsey testify in front of the US Senate Intelligence Committee this week, there will be some punishing questions about how the companies are preparing for the upcoming elections.

The executives will aim to show full dedication to preventing the kind of interference that occurred in 2016 when Russian meddlers used the companies’ platforms to try to sway American votes. But behind the scenes, there is a delicate struggle over who is accountable for ensuring that another election isn't compromised. Tech firms have been stymied in efforts to get federal agencies to