[{'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: Provide you with advertising based on your activity on our sites and applications and on third-party sites and applications. To learn more about how we use your information for personalization and tracking, please visit Online Tracking and Advertising. Optimize or improve our products, services and operations Detect, investigate and prevent activities that may violate our policies or be illegal"}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]