[{'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: You are not required to agree to allow Avast to post on your behalf. If you do not wish to allow Avast to post these messages, click "Skip" at this stage in the registration process. You can modify your posting preferences at any time via my Avast Account (https://my.avast.com/en-us/facebook).'}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]