[{'role': 'user', 'content': 'Analyze the following clause from a privacy policy and determine if it\'s fair or unfair. Also identify any privacy practices mentioned: In some of our messages, we use a "click-through URL" linked to information and content. When you click on such links, they may pass through a third party web server before arriving at the destination page on Start or on one of our partners\' websites. Celltick or its trusted partners may track this click-through data to help us determine interest in particular topics, measure the effectiveness and performance of our customer communications and promotions.'}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]