[{'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: For more information about Google Advertising privacy policy please visit http://www.google.com/policies/technologies/ads/?hl=en Changes to this Privacy Policy We may amend this Privacy Policy from time to time. Use of information we collect is subject to the Privacy Policy in effect at that time such information is collected unless you consent to additional use."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]