[{'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: If you choose Facebook as your registration or sign-in method, you will be asked for permission for Avast to take certain actions on your behalf. Specifically, we will request permission to post on your behalf in the following cases: (1) you register or install an Avast product; (2) you update an Avast program; or (3) an Avast program protects you from visiting an infected website. The messages that might be posted in such cases could include the following, or similar messages: (1) "Avast Antivirus just saved my computer from infection! Try it now. It\'s free."'}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]