[{'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: Uses and Retention: The information we collect from you ensures you can use the Viber Service and can be contacted on Viber. Your information is retained for as long as it is needed and helps us in our mission to constantly improve our Services and provide you with new experiences. As part of this mission, we may use your information for the following purposes: (a) Make our service available: We use your Registration and Account information to (i) register you for the App and create your User Account for Viber; (ii) create your profile and make it visible; (iii) process your payments; (iv) create your Viber ID; (v) provide customer service, give you information about your account, and respond to your requests; (vi) personalize your experience by providing content (such as games) on the Service, including targeted advertising of Viber services and other 3rd party services that we believe may be of most interest to you; (vii) improve the Service, including games provided by our Service, and make it a safer, efficient, and customized experience; (viii) indicate which of your contacts is already a Viber member and notify you when your contacts become active on the Service (ix) display the name of the contact as it appears in your address book when a call is received on the Service, and (x) sync your contacts with Viber running on Windows, MacOS, Linux, Android tablets, iPads and Windows Tablets. If you deactivate your Viber account, it will delete the address book from our servers (more about this below), quickly and permanently. Otherwise, we keep your contact information for as long as you use the App"}, {'role': 'assistant', 'content': 'This clause is unfair. The privacy practices mentioned are: Contact_1stParty, Contact_Address_Book_1stParty.'}]