[{'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: Opting Out of Third Party Service Measurement and Analytics: As disclosed in this policy, we use third-party providers to aid us in measuring and analyzing service usage. You may opt-out of web-based participation in these measurement services by following the instructions on the following web pages for each respective company: Nielsen and Scorecard Research. To opt-out of participation on mobile and tablet devices, please follow the instructions above listed in the section for Opting Out of Behavioral Advertising on Mobile and Tablet Devices."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]