Click here to visit the homepage for Fortune Most Powerful Women. You’ll see the U.S. MPW list, the Fortune International Power 50 , the 25 highest-paid MPW.

In his Fortune cover story, “Sheryl Sandberg: The Real Story”, Miguel Helft delivers insightful scoop about what the billionaire businesswoman and best-selling author actually does at Facebook .

“Twitter’s ambassador” is my profile of Katie Stanton, the soon-to-be-public social-media company’s international development boss. I visited Stanton at her new Paris home in August just four hours after she and her husband, Patrick, and their three kids arrived from San Francisco. A thrill-seeking globetrotter who started her Internet journey at Yahoo and Google , Stanton worked on Hillary Clinton’s innovation team at the State Department before she joined Twitter in 2010.

During that visit to Europe, I spent time with another MPW pioneer: Wendy Kopp, who started Teach for America 24 years ago when she was a student at Princeton. She’s been quietly but aggressively taking her well-known education reform program abroad. Teach for All is already in 30 countries on six continents. “Wendy Kopp Goes Global” has her talking, for the first time, about how she’s expanding and how she has convinced billionaires like Julian Robertson and Amazon.com CEO Jeff Bezos to help her.

“The Last Glass Ceiling?” is my essay–and call to action–on how to get more women leaders on public-company boards.

Who is the one woman who did not make the Fortune MPW list for the first time since launched it in 1998? Find out here, and read how else the list has changed over 15 years.

The 2013 MPW issue is available on the iPad and on newsstands Monday.

Finally, if you want to see next week’s Fortune MPW Summit, the main-stage sessions–including interviews with Sandberg, Yahoo chief Marissa, Mayer, IBM CEO Ginni Rometty, Spanx founder Sara Blakely, entrepreneur Tory Burch, and Warren Buffett –will be livestreamed here next Wednesday and Thursday. Enjoy!