Thing is, as time has gone on and the effort to monetize the site has become more apparent, users are seeing that privacy slowly erode. Yes, you can still maintain it, but you have to tell Facebook not to share, the site doesn't ask if you want to.

In other words Facebook assumes you do, it doesn't assume you don't.

Regular users of the site may recall seeing this lately:

Basically Facebook is entering a deal with a selection of eCommerce sites to allow them to peek into your pages and make product recommendations based on what they find there. Yes, lots of sites (most notably Google) track your Web activity for this very purpose, so it's nothing new really.

Except––Facebook has way more information about its users than simply what was the last item they looked at on eBay. For many people this raises some serious privacy concerns. And while Facebook does provide a mechanism by which you can guard your pages, it doesn't make the interface to accomplish this readily discernable.

When you click on the  Learn More link at the bottom of the page represented above, you're taken to a page describing the new service.  When you get all the way to the bottom of that second page, you'll see this:

In other words, it's assumed you're cool with the compromising of your privacy and it's up to you to tell Facebook you're not.

To do so, you must do the following:

1. Go to your to your privacy settings ->Applications and Websites and uncheck box at the bottom.
2. Then click on the links to Yelp, Pandora, MicrosoftDocs.com, et.al. on Facebook and click on “Block Application”

You must do this for each application listed. If your privacy is an issue for you, these tools will help you protect it from this latest innovation. However, be forewarned, there's bound to be lots more in the offing.

Stay diligent.