The Friend Who Said 'No' to Facebook

David Kerley gets the back story on one of Mark Zuckerberg's college pals.
2:29 | 01/30/12

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Transcript for The Friend Who Said 'No' to Facebook
This week a FaceBook is expected to announce plans to go public and sell stock and that will make. Mark Zuckerberg one of the youngest. -- -- -- -- Billionaire you by any third richest guy he can't throw some money I was I wish I had back in the day soon I -- -- don't pay Yahoo! didn't throw money back in the day. One of the Zuckerberg is real life friends passed up the chance to join him at the very beginning. Does he have any regrets now yes yes yes Jackie ABC east -- currently the. Joseph Greene is the FaceBook friend you've never heard of anything -- Needs. He was there in the college dorm. For the birth of FaceBook dramatized in the movie the social network. Green was one of FaceBook founder Mark Zuckerberg roommates but he didn't make the movie -- Just FaceBook. That's because when Zuckerberg asked -- to drop out of Harvard with him to build FaceBook. Green said no we've gotten a little bit a travel with a previous project. That project their first web site asks students to rate the looks of fellow classmates hot or not. Harvard officials threatened them with expulsion. My father who's a professor -- not a happy the passing me. Getting kicked out of school where privacy now that's it has become while -- record as literary likes to make fun night activists -- where we're still very close. Instead. Green followed his passion for politics and work for John Kerry's presidential campaign. Colleagues call that decision greens 400 million dollar mistake he share if he had helped start FaceBook -- slick was about. But he's back in the FaceBook full running a company called causes it's a FaceBook application and web site. Which lets friends suggest to friends a charity a social cause even a candidate. The way to get people cynically engaged they're not just during an election by the -- here. Is it's happened to FaceBook and to let them do with their friends thank you mark as candidate Obama proved. Social media is a powerful political -- you can't ignore it it's like you'd like ignoring television ignoring you know. Mail rates it's become -- such an interval part of people's lives. Already Green says his company -- help raise fifty million dollars for 50000 charities. The roommate who says no has no regrets. Yes plenty of FaceBook stock. And he's found his cause everyone has the ability inside of them to make a difference David -- ABC news Palo Alto, California.

This transcript has been automatically generated and may not be 100% accurate.

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