Investors, entrepreneurs and techies around the world will be keeping an eye on the IPO, which is expected to act as a bellwether for the business validity of other social networks.

In a that Facebook released last week, Zuckerberg, wearing his usual gray t-shirt and talking directly into the camera, said he knew the social networking concept would take hold. He said he wasn't sure that Facebook would be the one to make it happen.

"We design our products to be social from the ground up," Zuckerberg said in the video. "We think people's lives will be better, and the whole world will function better, when there is more information out there. In the world there exists this map or graph of all the relationships around the world... Now there are real people on the end of the connection. Before Facebook there was no way to do that."

The 31-minute video shows snippets of videos posted on Facebook and images of users' Timelines, photos and posts.

Facebook COO Sheryl Sandberg, participating in the video, focused on the business aspect of the social network.