We look to the Internet for news, socializing, shopping, research and more. From HTML code to instant messaging, we'll break down what's really going on whenever you log on, send an e-mail, visit a popular Web site or post to a blog.
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Your IP address is one of 4.3 billion unique numbers that identifies your computer on the Internet. Learn the different IP classes and discover how your computer gets its own address.

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With all the Internet spying going on out there, it seems like it would be easy to know who's viewing your Facebook profile. Lots of apps promise they can, but can they really?

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Someone at the CIA is editing Wikipedia entries about lightsabers. How do we know? The Wikipedia Scanner. Virgil Griffith created the WikiScanner to catch politicians, corporations and government agencies in the act of trying to change their Wikipedia entries anonymously.

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