[{'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: An entity tag (or ETag) are HTTP headers that are sent-behind-the-scenes between a web browser and a web server. They can be used to track unique users in place of cookies, and allow us to better understand and improve WeChat."}, {'role': 'assistant', 'content': 'This clause is unfair. The privacy practices mentioned are: Identifier_Cookie_or_similar_Tech_1stParty.'}]