[{'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: When you participate in one of our surveys, we may collect additional profile information. You may also provide other types of Information to us voluntarily, such as your operating system and version, and other information requested if you contact us via e-mail requesting support from UCWeb Services. It is your choice whether to send personal information to us."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]