Obsessively checking e-mail. Playing online games for 12 hours or more at a time. Placing more value on chat-room friends than real ones. Just what is computer addiction, and why do some doctors disagree over whether it exists at all?
It's happened to almost all of us at some point in our Web surfing experience -- you're visiting a new site when all of a sudden your screen begins to fill with boxes advertising goods and services. Enter the pop-up blocker.
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.