Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
and they know this information, how?
At least in terms of DVXuser, there's no way to know this stuff.
Please don't take offense, but this is naive. The companies who do these analytics (primarily Google and Amazon) have a perfectly easy way to know this and a lot more stuff that would be even more impressive/scary to see in a graph.
I suspect you're underestimating a) the amount of personal information people freely and unknowingly divulge while surfing; b) the sophistication of large web players; and c) the power of sampling methodologies across large populations.
If Google merely aggregates visitors' zip codes and what sites they visit before and after DVXuser, it doesn't take more than few thousand hits before Google has an extremely accurate picture of site demographics. And in fact they have much better info than this.
Anyway, the graphs above are taken from Amazon's analytics (check Alexa.com and punch in a few sites). Pretty eye-opening stuff, and interesting to play around with.[/COLOR]