The company created a website to help customers. Here are tips to protect yourself online, and a quiz to determine how often your data has been exposed.

• Major earthquake rattles Mexico.

The most powerful quake to hit Mexico in 100 years struck off its Pacific Coast late Thursday, rattling millions of residents of Mexico City with its violent tremors and claiming at least 32 lives.

• Russia and the U.S. election.

An investigation by The Times and new cybersecurity research document the social media accounts with ties to Russia that intervened in last year’s presidential election.

On Thursday, Donald Trump Jr. told Senate investigators that concerns about Hillary Clinton’s “fitness” to be president had prompted him to set up a June 2016 meeting with a Russian lawyer. He denied any collusion.

James Comey. Bernie Sanders. Flawed messaging. And, yes, emails. Those are some of the campaign pitfalls that Mrs. Clinton lists in her book “What Happened,” which comes out next week.

• “The Daily,” your audio news report.

In today’s show, we discuss President Trump’s unexpected new alliance with the Democrats.