Are Unique Visitor Counts Over?
Many users regularly delete cookies from their computers. How does this affect your ability to track unique visitors?
Many users regularly delete cookies from their computers. How does this affect your ability to track unique visitors?
Are your unique visitors truly unique? As many as 39 percent of online users delete cookies from their primary computer each month, according to a new Jupiter Research (a Jupitermedia Corp. division) report. The survey referenced in this report found 12 percent of consumers delete cookies monthly; 17 percent weekly; and 10 percent daily.
This indicates traditional unique visitor counts are increasingly inaccurate, and possibly irrelevant.
It’s imperative to understand this trend’s effect. A user deletes or rejects a cookie. When she returns to the site later, she’s registered as a unique visitor. An inaccurate unique visitor count can potentially skew the accuracy of your Web analytics metrics, including information you may be using to sell advertising or maintain relationships with affiliates. In previous columns, I’ve discussed the importance of having accurate data for decision-making.
Look at the data from your Web analytics tool. If you have fewer returning visitors and more new visitors when nothing else has changed in your business, you may be experiencing the effects of this cookie blocking and deleting trend. All our clients experience it, and an increasing percentage of their site visitors aren’t accepting cookies at all.
Typical Visitor Tracking Methods
There are a number of different ways to track visitors. The three most common are:
First-Party vs. Third-Party Cookies
There’s an important distinction between first- and third-party cookies, especially when it comes to how spyware, browsers, and users treat them. This how Microsoft defines first- and third-party cookies:
Different browsers and spyware programs have different settings for how to handle first- and third-party cookies, whether rejection or deletion.
Jupiter Analyst Eric Peterson believes businesses must reexamine their use of metrics and determine which long-term measurements could be affected by cookie blocking and deletion.
“What we define as a ‘visitor/customer lifetime’ is greatly accelerated in the online space,” said Matt Jacobs, the senior analytics manager at ZAAZ (where I work). “When you couple that fact with a high rate of cookie deletion, ad networks and most Web analytic vendors are presented with some interesting and difficult challenges for RFM (recency/frequency/monetary) and lifetime value analyses.”
The full outcome of this trend on site analytics, ad networks, affiliate programs, and personalization is yet to be seen. Also of interest is the future effect of the trend: the ability to act on visitor data and use it to tune and optimize site performance. Skeptics may seek ways to minimize this issue, but cookie blocking and deletion is a reality and it merits attention. It can potentially skew data you may be relying on to make important decisions.