Tech giants on Capitol Hill

Executives from Facebook and Twitter will testify today about their response to foreign interference in elections and their moderation practices. They’re expected to take a conciliatory approach, but it remains to be seen how they’ll respond to accusations of bias. Here’s what to watch for.

While the companies have tried to crack down on hate speech, they acknowledge they have been slow to act. Some content that violates Facebook rules thrives in private groups.

• Can you identify posts designed to fool you? Take our quiz.

Depiction of a dysfunctional White House

“Fear,” by the veteran journalist Bob Woodward, is the latest book to describe top officials working to undermine President Trump’s impulses and privately insulting him.

The anecdotes, gathered by nameless interviews with current and former officials, include Defense Secretary Jim Mattis comparing Mr. Trump to a “fifth or sixth grader,” and Gary Cohn, then the chief economic adviser, removing an important letter from the Oval Office desk so the president would forget to sign it. (According to the book, he did forget.)

Mr. Trump accused Mr. Woodward of making up quotes and of running “a con on the public.”

• Here are the book’s key takeaways and our review.