[{'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: Changes to this Notice We may amend this Privacy Notice at any time by posting the amended terms on this site. All amended terms automatically take effect 30 days after they are posted. We will announce any material changes to this Privacy Notice through the eBay Message Center and/or via email."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]