[{'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: Users can set preferences for how Google advertises to you using the Google Ad Settings page. Alternatively, you can opt out by visiting the Network Advertising Initiative Opt Out page or by using the Google Analytics Opt Out Browser add on."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]