Facebook's new life-saving tool that helps people become organ donors evolved in part out of a note the company's COO Sheryl Sandberg read on her college reunion newsletter.

Sandberg, a Harvard grad, told ABC's "World News" anchor Diane Sawyer that her fellow alumni write "passages about their lives" ahead of reunions and she read one written several year ago by Dr. Andrew Cameron for the class' 15th reunion.

Cameron is the head of liver transplants at Johns Hopkins Hospital. "He wrote about the patients who die waiting for organs and talking to their families about, 'We're so sorry. We don't have an organ to save your husband, your father, your daughter, your son,'" Sandberg told Sawyer.

"This was hugely meaningful for me," she said.

It would take another five years before Sandberg would be in the position to take action.

"At our 20th reunion, Sheryl was now COO at Facebook, and with this really powerful communication tool in hand, we crossed paths again," Cameron told

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Facebook to Help Find Organ Donors

ABC News' Robin Roberts talks to Mark Zuckerberg about the site's new tool.

Conversations over the dinner table with his med-student girlfriend helped Mark Zuckerberg formulate his latest big idea -- harnessing the power of Facebook to help eliminate the critical shortage of organs for patients desperately in need of life-saving transplants.

And it was his friendship with Apple founder Steve Jobs, whose life was extended by years following a liver transplant, in part, that spurred the 27-year-old Facebook founder and CEO to help put that idea into practice.

"Facebook is really about communicating and telling stories... We think that people can really help spread awareness of organ donation and that they want to participate in this to their friends. And that can be a big part of helping solve the crisis that's out there," Zuckerberg told ABC's Robin Roberts in an exclusive interview at the company's headquarters.

Starting today, users in the United

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By Russell Goldman and Emily Friedman Acting very much like the Republican presidential nominee, Mitt Romney sent a curt message to President Barack Obama today:  "Start packing."

The message, delivered with a chuckle, came in an exclusive interview with "World News" anchor  Diane Sawyer who asked the presumptive GOP nominee if he had something to say to the president.

Romney said Obama's "policies have not helped the American people.  They have not helped get jobs, they have not helped raise incomes and they've added trillions of dollars of debt."

He was backed by his wife of 43 years, Ann Romney, who told Sawyer she also had a message for Obama. "I believe it's... Mitt's time... It's our turn now," she said.

See the exclusive interview tonight at 6:30 p.m. ET on "World News With Diane Sawyer" and 11:35 p.m. ET on "Nightline."

Last week, the Romney campaign was able to flip the Democrats' so-called "war on women" strategy by highlighting a Democratic strategist's attacks on Ann Romney Read More »