[{'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 particular, in relation to targeted advertising, we use third-party advertising companies to serve ads when you use our app. These companies may use information about your visits to this and other websites in order to provide advertisements about goods and services of interest to you."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]