[{'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: Advertisers may use third party services to ensure their ads are properly served and to measure the success of their campaigns on websites and apps. We allow these services to collect and use the information for such purposes."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]