[{'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: Use and Retention We use the personal information we collect to: provide and improve our Services, provide you with a personalized experience on our sites (especially, by offering you services and items that you may like), contact you about your account and our Services, provide you customer service, provide you with personalized advertising and marketing, and detect, prevent, mitigate, and investigate fraudulent or illegal activities."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]