[{'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: Metadata Metadata is usually technical data that is associated with user content ("Content") and can describe what, when, where, how, and by whom a piece of Content has been generated. When using our Services, we will use the metadata of the photos to provide more precise functions of "Facial Detection", "Key-Points Recognition", "Region Segmentation", "Content Tags" and the other customized function on the basis of the combination of the mentioned basic functions. This metadata is used to improve our Services and is NOT USED to identify and track our users individually.'}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]