tk_ni / tk_ai / tk_qs Gathers information for our own, first party analytics tool about how our services are used. A collection of internal metrics for user activity, used to improve user experience. tk_*r Referral cookies used to analyse referrer behavior for Jetpack connected sites using WooCommerce. wp-affiliate-tracker Remembers the ID of the affiliate that referred the current user to WordPress.com utma / utmb / utmc / utmt / utmz / ga / gat / gid Google Analytics. Gathers information that helps us understand how visitors interact with our websites, which allow us to create a better experience for our visitors. Our users may also implement Google Analytics on their own websites. <b>