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Zuckerberg, 24, told an audience of 1,000 industry executives, software makers and media at Facebook's annual conference of how the company's features will run on affiliated sites outside its own.

Facebook Connect will transform the social network from a private site where activity occurs entirely within a "walled garden" to a web-wide phenomenon where software makers, with user permission, can tap member data for use on their sites.

Users of sites such as Digg.com, for example, will be able to link their login with their Facebook profile, allowing friends to see when they Digg a news story.

"Facebook Connect is our version of Facebook for the rest of the web," Zuckerberg told the second annual F8 conference.

Facebook has seen its growth zoom to 90 million members from 24 million a little over a year ago, overtaking rival MySpace to become the world's largest social network.

It has lured 400,000 developers to build programs for it since opening up its site in May 2007. Now Facebook is letting designers build software on affiliated sites, for mobile phones or as services that tap desktop applications such as Microsoft's Outlook. In coming months, it said it would let designers building software for Facebook simultaneously create versions for Apple's iPhone.

"As time goes on, less of this movement is going to be about Facebook and the platform we have created and more about the applications other people have built," Zuckerberg said.

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"This year, we are going to push for parity between applications on and off Facebook."

Zuckerberg's mission

Zuckerberg, who dropped out of Harvard to run Facebook, is a shy programmer turned billionaire with an anything-but-humble vision to make the world a more "transparent" place to live.

"I want to be able to build a product that allows you to be able to see a person and feel their presence, to have people have more open connections by helping them to share more," he told attendees.

"Facebook's mission... is to give people the power to share [information] in order to make the world more open and connected. By giving people the power to share, it makes it more transparent."

Driving the popularity of Facebook has been a wave of more than 24,000 applications from independent software makers that work within site. But the last year's rapid growth has come at the cost of frequent abuses by software developers of members' privacy. Company officials admitted that they shut down 1,000 applications for privacy violations in the past year.

Connect marks a new effort by Facebook to expand outside its own site after it retreated from an earlier effort called Beacon that was decried by privacy advocates and which connected member activities inside Facebook to sites outside.

"We took this approach of getting it [Facebook's open software development platform] out as quickly as possible... We just iterated as fast as we could," Zuckerberg said. "I am also the first to admit we made a lot of mistakes."

Facebook said it is implementing a stringent verification process for developers to reassure users their private personal information will be securely handled outside Facebook.

In a move that drew complaints from excluded developers, Facebook named 24 preferred partners it feels have set high standards for respecting users' privacy. Others can apply to participate in Connect in coming weeks, a spokesman said.

Among others, early partners include Digg, StumbleUpon, Twitter and Xobni.