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Also: The White House says a tariff announcement could come this week; an adult film actress sues President Trump over an NDA covering an alleged affair; and Saudi women learn to drive.

The social network filed to go public earlier this week and is hoping to raise $5 billion in a huge IPO. The markets are buzzing, but what might it mean for an individual investor? Melissa Block gets the story on how high profile IPOs work from Dennis Berman, Marketplace editor at The Wall Street Journal.

Also: A Pennsylvania congressman won't seek re-election after a report of an abortion request; President Trump's Puerto Rico golf venture; and the grave of St. Nicholas is reportedly discovered.

Also: Reviewing the GOP's tax blueprint; scores of protesters are arrested in St. Louis in anti-police brutality demonstrations; and it's the 60th anniversary of the Sputnik launch.

When online social networks open up spaces for suicide prevention with untrained peer support, they walk the fragile line between invasion of privacy and supporting those who need help.

Also: Rock musician Tom Petty has died; the Supreme Court takes up a gerrymandering case; and baseball's Hall of Fame is getting a bobblehead museum collection.

Also: Georgia lawmakers punish Delta over cutting NRA ties; President Trump will attend Rev. Billy Graham's funeral today; and the Iditarod opens tomorrow, enmeshed in controversy.

Xi Jinping will visit President Trump in Palm Beach, Fla., next week, for talks that will reportedly center on economic and other issues.

Democratic enthusiasm was up in Texas, but it's still a very Republican state. Statewide, Democrats face an uphill climb, but in key suburban House races, they could make gains.

Current facial recognition technology is still not as powerful as it seems in the movies — not yet. Some big challenges stand in the way of what you might call "universal facial recognition." But those problems are being solved by all of us, every time we upload photos and label faces on social media.