Here's how it works: as you read a story on a website that has the Recommendations Bar feature activated, you'll see pop-up windows in the bottom right corner of the page. The pop-up window will contain stories from the website that your Facebook friends have shared or liked. The window also contains a Like button, allowing you to like the story without ever leaving the website.

Several sites already use this feature, including the tech blog Mashable, entertainment site Wetpaint, and U.K.-based tabloid The Mirror. Recommendations are limited to articles on the website that were shared by Facebook users. Websites using the new feature reportedly see as much as three times as many clicks on stories that are recommended in the pop-up boxes.

This feature obviously benefits the website owner, but what's the benefit to you? There isn't really one--it's just another reason to be worried about your privacy on the social networking site.

Don't get me wrong--relevant recommendations from friends might be helpful. There's a good chance that the recommended content will be something that we'll be interested in reading, since we often pick our friends based on shared interests.

But there's another side to this issue, and that's the potential privacy concern. When Facebook debuts services that share, without your explicit permission, what you're doing online...well, .