[{'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: Service-related announcements We may from time to time send you service-related announcements when we consider it necessary to do so (such as when we temporarily suspend WeChat for maintenance). You may not opt-out of these service-related announcements, which are not promotional in nature."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]