Mark Zuckerberg said the changes were necessary
Social network Facebook has said it will offer a one-stop shop for privacy settings in response to user concerns.
Mark Zuckerberg admitted the settings had "gotten complex" for users.
It follows a storm of protest from users over a series of changes on the site that left its members unsure about how public their information had become.
"We needed to simplify controls," he told a press conference.
The new system will offer users one privacy page with a list of all their applications and a choice of three settings for each.
The redesigned privacy page allows users to see all their information in one grid and apply privacy settings to each. Facebook will suggest defaults.
As with the changes made in December, users will be able to choose to share their applications with just friends, friends of friends or everyone.
"We've focused on three things: a single control for your content, more powerful controls for your basic information and an easy control to turn off all applications," said Mark Zuckerberg, speaking at Facebook's Palo Alto headquarters.
Analysis
Continue reading the main storyRory Cellan-Jones
Technology correspondent, BBC NewsOn the face of it, Mark Zuckerberg has delivered on his promise to make the privacy settings simpler.
One button which will change everything is certainly an advance on what went before.
There's also the opportunity to opt out completely from sneding your data out of Facebook to other applications.
But questions remain - the recommended setting still look designed to encourage users to share just about everything.
And I'm still working out just how I can stop my list of friends being visible to the whole world. Experience shows that every change at Facebook seems innocuous at first - and creeps up later to bite some users and the company itself.
Q&A: Facebook privacy changesPeople who want more "granular control" will still be able to access existing settings.
Facebook has also reduced the amount of information that is visible to everyone. People will now be able to control who sees their interest pages and friends lists.
Users will also be able to turn off applications to ensure no information is shared without consent.
One of the things users found complicated was the need to apply new settings to every new feature introduced on the site.
From today, whatever setting users choose for "Sharing on Facebook" will now automatically be applied to any new products.
Initial reactions to the changes questioned whether Facebook had gone far enough.
Big battle"The vast majority of people don't use privacy settings so the reforms are not likely to have as great an impact," said Simon Davies, director of Privacy International.
"If the default is for less information then we've really made a step forward," he said.
With European privacy commissioners calling for companies to set defaults for the minimum sharing of information, the big battle could be "yet to come", he warned.
"That's where the rubber hits the road at a legal level."
Andrew Walls, a research director at Gartner wondered how the changes would affect Facebook's business model.
"Some questions not really answered were issues around the sharing of personal data with advertisers for doing targeted ads based on profile content. That's a tricky one - how do you make money if you can't sell targeted ads? How do you compete with Google?"
"They want sufficient privacy to attract users into service and take advantage of it but some sharing of data is also required in order for Facebook to make money," he said.
Mr Zuckerberg said that developers had "worked weekends, camped out in the conference centre" in order to overhaul its privacy settings.
"The number one thing we've heard to that the settings have gotten complex and hard for people to use," he said.
"It is something we take very seriously," he added.
He spent time explaining how Facebook has evolved from a very basic system when it was launched in 2004 to the 400m user site it is today.
"When we started Facebook, we built it around a few simple ideas. People want to share and stay connected with their friends and the people around them. When you have control over what you share, you want to share more. When you share more, the world becomes more open and connected," he said.
But since then the site has rolled out hundreds of new features and, alongside them, a raft a privacy settings.
Changes made to the site earlier this year and in December 2009 infuriated users and led to formal complaints from privacy groups.
The European Commission described the changes as "unacceptable".
Are you a Facebook user? What is your view on the new privacy settings?
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