[{'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: Audience Information. When you use our app, Nielsen Measurement collects information about your use of the Service. If you wish to opt out of Nielsen's digital measurement research, please visit the link to Nielsen Measurement in the app settings."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]