Facebook Beacon is a way for your friends to find out what you've purchased through Facebook. It sounds like a good idea, right? Unfortunately, it also raises privacy issues, which is why now is a good time to turn it off. Here's how to block Facebook Beacon: Click on "privacy" in the top-right corner of any Facebook page.Click on "External Websites" (below "Applications").Check the box that says "Don't allow any websites to send stories to my profile."Click on "Save"!--