The Cookie is Dead…
Traditionally, web tracking has been done with a third party cookie. Within the last couple years, third party cookies have come under increasing criticism due to privacy concerns.
Consider the tracking cookies you certainly have on your system. Owners of these cookies can essentially track and archive every site you visit on the web that contains their scripting (if you let them.) Every single move you make is recorded, and stored for eternity. This is kind of scary if you ask me.
Check out our friends at Google for instance. Genius aren’t they? Google is best known for being the king of search. Rightly so. I think they are also the king of the cookie. They have code on many, many, MANY websites that they are using to spy on us, and log every move we make. In fact their analytics program is reportedly used on 400,000 sites now.
It’s no wonder that anti-spyware makers and vendors of internet privacy software have begun a “seek and destroy” campaign against third party cookies. With the resulting war on third party cookies, they no longer represent a viable way to track test results or any results.
Long Live the [1st Party] Cookie!
First party cookies do not suffer the same challenges of being deleted or rejected that the more common third party cookie faces. The reasons are as simple as they are compelling.
The first party cookie can only be viewed by scripts on the domain that set it, making it nearly impossible to track a users movement from one website to the next. This is good for privacy as well as conversion tracking. As users, we get the peace of mind that big brother is not looking down on us. As web experimenters, we get more accurate results.
Long Live [Testing]
It turns out that third party cookies are horrible for testing, because they are deleted so frequently. Depending on what you are testing, this could really throw your stats off.
I recently tested a homepage, all the way to a purchase (not recommended by the way.) A full 50% of users converted latently, many after two weeks. If you were using a third party tracking cookie, that would mean losing 50% of your data. Or even worse. This makes getting a statistically reliable result impossible, especially when the difference between the pages may be as small as .5%.
Warm Regards,
Scott Miller, CEO
Author of “The ConversionLab.com,” The worlds first “How to” guide to testing and optimization. Visit http://www.conversionlab.com/ for a special offer!