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Facebook's privacy policies are confusing to many people, and the company has changed them frequently, almost always allowing more information to be exposed in more ways.

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.

If there's a danger at Facebook, it's the assumption that Facebook has us all locked in and we aren't going to go elsewhere.

Sharing with just your friends doesn't protect your privacy. I know the people at Facebook will disagree and argue that users can control what is shared with whom. But this is simply an illusion that makes us feel better about all the sharing we have done and are about to do.

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.

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 suspect privacy is a very new concept to humanity.

There's a feature on Facebook where you can enable security that checks the device you're coming from. By default these features are likely off, but as a consumer, you can enable them.