As pierrfar has shown, they disable any caching, so even if you use the same icon on several pages of your site the browser will have to re-download it every si

As pierrfar has shown, they disable any caching, so even if you use the same icon on several pages of your site the browser will have to re-download it every single time. Now all they need is to to log the client IP and client agent string and they have a fairly accurate global clickstreams for all users over all sites that use this service (not to mention what they could do with a cookie).