You've heard the horror stories about how Facebook's Beacon ads can ruin your Christmas. Even though Overstock.com — the online retailer whose use of Beacon caused most of the uproar — has turned Beacon off, there's no telling who Zuckerberg might sucker into installing the ads next. Take action now. Use Facebook's new privacy options to turn it off. Here's the simple four-click process.

Just click where the red arrow points.

Step 1

Step 2

Step 3

Step 4

That's the easy way. If you're really paranoid, technically adept, and have time on your hands, Lifehacker has a more complicated way involving a Firefox extension.

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