 Pixel tags or clear GIFs We may use sensing technologies that use pixel tags or clear GIFs (which are also called web beacons). These technologies allow us to determine the effectiveness of our e-mail and advertising and marketing efforts. For this purpose, we tie the pixel tags and clear gifs to personally identifiable information. We may also collect information regarding the links within such marketing materials that you click on and purchase statistics regarding items you buy following receipt of such marketing. 