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Facebook allows outsiders to add functionality to the site but reserves the right to change that policy at any time, to charge a fee for applications, or to de-emphasize or eliminate apps that court controversy or that they simply don't like.

Whether it's Facebook or Google or the other companies, that basic principle that users should be able to see and control information about them that they themselves have revealed to the companies is not baked into how the companies work. But it's bigger than privacy. Privacy is about what you're willing to reveal about yourself.

Facebook is by far the largest of these social networking sites, and starting with its ill-fated Beacon service, privacy concerns have more than once been raised about how the ubiquitous social networking site handles its user data.

I am not a fan of Facebook or Twitter. They both allow too much information to be available and they make privacy a thing of the past.

Facebook's the real deal. Nobody can buy Facebook now. Everybody has taken an angle at it. But Facebook may be the place that organizes everybody's personal information. It's got a very good chance of being that.

I speak at a lot of universities, and people are always worried about Facebook, and when I explain how to use it properly, they immediately go back and make those changes.

Facebook is weird. They have all of these seemingly random rules that I'm sure make sense to them, but don't make sense to me or any people.

Facebook says, 'Privacy is theft,' because they're selling your lack of privacy to the advertisers who might show up one day.

Nobody is forcing anybody who is uncomfortable with the terms of service to use Facebook. Executives point out that Internet users have choices on the Web.