I have found it very difficult to find any figures on estimates of first party cookie rejection/blocking – I couldn’t find anything specific through ComScore, the WAA or the IAB.

However, I have finally found an article which says:

“It is estimated that a very low percentage of people block first party cookies, less than 5%.”

The reference for this quote is:

http://www.opentracker.net/en/articles/all-about-cookies-third-party.jsp

I wonder where they get their data from and if it is still accurate?

Brendan.

Thanks a lot for adding NEW data to the conversation. Super interesting. In regards to Cookie Rejection, you should go look up the studies that ComScore has done on this. I also commented on this, from a slightly different angle:

http://visualrevenue.com/blog/2007/06/cookies-and-their-effect-on-unique.html

Cheers
d. :-)

I have set up some noscript tracking using Google Analytics on one of the websites I work on. It picks up accurate pageview data but the session data is not accurate because there is currently no way for the CMS to insert a unique value in the appropriate parameter of the utm.gif for each user session/visit (this will change soon).

However, when I estimate the number of noscript visits based on the overall average pageviews per visit figure, the percentage of noscript visits out of total visitation is 1.07%. The data covers the period 18 July to 28 September 2010 and the data size is quite large (in excess of 100,000 visits).

One question for you though is about cookies and their effect on web analytics data. If people have their browser/s set up to reject first and/or third party cookies, then it doesn’t matter if you have a noscript method of tracking installed (the analytics tool you use and its cookie methodology of course plays a part here). Is there some data around to suggest what percentage of browsers are set up to reject these cookies? I am unaware of a way to track this using browser based methodologies. I suppose there might be some way to do it in your log files, but I am very wary of log file data for many well known reasons.

Kind regards,

Brendan.

It very much seems like, most websites today, and most certainly tomorrow are deploying JavaScript for not only extended functionality, but for basic functionality. That being the case, I personally can’t see people disabling JavaScript anymore, than they do today, as surfing the web and using your standard services becomes difficult to the point of impossible – whether that being your Internet Bank or your favorite retailer.

Perhaps it’s time for some updated research, instead of opinion data :-)

cheers
d.

We maintained a list of robots which were excluded from the reporting. Not to say that a non-human couldn’t call the pixel – however, when that did happen, our customers typically just out-segmented that themselves.

Cheers
d. :-)