Over the past couple days new tracking cookies associated with demdex.net* have started appearing, seemingly skirting around "do not track" browser settings.
They also appear associated with companies (eg, postmedia.demdex.net) and financial institutions (eg, td.demdex.net).
If you don't want to be tracked by this organization, you'll likely have to explicitly block such in your browser's privacy and security area. Or you can try Ghostery or some other tracking cookie blocker.
* demdex.net is a domain used by Demdex which is an advertising company that is part of a network of sites, cookies, and other technologies used to track you, what you do and what you click on, as you go from site to site, surfing the Web. Over time, sites like demdex.net can help make an online profile of you usually including the sites you visit, your searches, purchases, and other behavior. Your profile can then be exchanged and sold between various companies like demdex.net as well as being sold to other advertisers and marketers.
