HARI SREENIVASAN:

Now: two high-flying companies whose value has soared and are the subject of intense scrutiny, Uber, and the parent company of Snapchat.

For Uber, it's about the culture and leadership of the ride-hailing service, valued at nearly $70 billion. It's back in the spotlight following release of a video of its CEO berating an Uber driver. More on that in a moment.

But, first, Snapchat is about to sell its stock to the public for the first time. The parent company announced it will offer its share at $17 a share, bringing its value to nearly $24 billion. The messaging app is used by nearly 160 million people each day, and is especially popular among teens and young adults.

But there are big questions about whether it's worth this kind of value.

Mike Isaac is covering both these stories for The New York Times. He joins me now.

Let's start with Snapchat. What is the value that Snapchat is trying to sell investors?