This suggests that sites which rely on information collected from registered users, should probably interpret their numbers conservatively. There were no noticeable differences between European and US respondents.
More females report never having registered with a Web site.
The goal of this question was to gain an initial understanding of user's knowledge about what can be logged on a per transaction basis. That is, for each page requested, users where asked which of the following information can be logged by the Web server issuing the page. This question reveals that while the majority of users understand the basic information that can be recorded per transaction, many do not know some of the advanced features like cookies. Overall, Europeans tended to have a better understanding of what information is loggable than their US counterparts. In general, males tended to have a better understanding of what is loggable than females, typically by 7-13 percentage points.