Maybe you didn’t know this, but both my wife and I are on Facebook. Now let’s say I don’t know about Beacon. I buy her a Christmas gift from a Beacon-enabled online store, and guess what? She sees it next time she logs into her account.
There you have it: Christmas morning ruined. Thanks a lot, Zuckerman.
If you don’t want your loved ones peeking under the wrapping paper while browsing their News Feed, maybe you should consider installing Aaron Brazell’s Freakin’ Beacon Firefox extension. It’ll let you know when you’re on a Beacon-enabled site, so you can avoid it like the plague.