[{'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: We collect the minimum information required to achieve the purposes set out in this Policy (see below), and you have the ability to limit such collection, as specified below under "Your Choices": (a) Registration and Account Information: When you use our various Services you voluntarily give us personal information (e.g., name, email, birth date, phone number and, when necessary, billing information) and you are not anonymous to us. That means your name and photo (if you choose to provide them) will be visible to other Viber users. When you install the Viber App, you\'ll also be asked to allow us access to your mobile device\'s address book. A copy of the phone numbers and names of all your contacts (whether they\'re Viber members or not) will be collected and stored on our servers in order for us to be able to enable you and your contacts to connect. When you join Viber, the contacts in your address book that are already Viber members may be informed that you\'re now on Viber too.'}, {'role': 'assistant', 'content': 'This clause is unfair. The privacy practices mentioned are: Contact_Address_Book_1stParty, Contact_E_Mail_Address_1stParty, Contact_Phone_Number_1stParty, Demographic_Age_1stParty.'}]