Coupons.com Software Shares User IDs with Arbitrary Third Parties
A Closer Look at Coupons.com - Ben Edelman

This page reads and presents your Coupons.com User ID.

Privacy Implications

Coupons.com software provides a user's unique user ID to any web page that invokes Coupons.com's simple "GetDeviceID" JavaScript interface. Any web page a user visits can retrieve this ID. In fact, the JavaScript is so straightforward that it can even be embedded within a page element, i.e. a banner ad or a tracking beacon. Via a HTTP POST, invisible frame, or various other methods, such a web page (or page element) can then transmit the user's unique ID to any desired web server.

This page retrieves a user's ID using the specified Coupons.com "GetDeviceID" JavaScript interface. However, this page does not make any further use, copy, or transmission of the user's ID. In particular, this page does not transmit any user ID back to any web server, nor does this page store a user's ID in any other way.

Additional discussion. Screenshot of results on a computer with Coupons.com software.