[{'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: Download and Registration When you download an application that is part of the Service you are requested to register with us. For registration through Tango, you are only required to provide your mobile phone number or your email address, depending on the device(s) you are using on the Service. You may also provide other personally identifiable information, but that is optional. When you log in using your Facebook account, we collect additional information you make available to us (see "Your User Profile") below.'}, {'role': 'assistant', 'content': 'This clause is unfair. The privacy practices mentioned are: Contact_E_Mail_Address_1stParty, Contact_Phone_Number_1stParty, Facebook_SSO.'}]