[mcphage]

Based on that, won't the presence of facebook on the ITP list mean either you go to Facebook, or that you've been to multiple sites that have checked if you go to Facebook? ie, won't these techniques soon end up with all false positives?

[BoorishBears]

If you make random domains that only your site references, and they're on someone's list, then you know it's your site

[mcphage]

You don't need this to determine that someone goes to your site—they're there. This is for tracking people as they go to other sites, and for determining what other sites the people on your site have gone to.