[{'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: Personal identification information We may collect personal identification information from Users in a variety of ways in connection with activities, services, features or resources we make available on our Services. We will collect personal identification information from Users only if they voluntarily submit such information to us. Users can always refuse to supply personally identification information, except that it may prevent them from engaging in certain activities."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]