[{'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: 2.4.3 Opting-out Ways to opt-out of our Services: if we send you an email, there will be an unsubscribe link; if we post updates via Facebook you can 'unlike' our page and you will no longer get updates; if you receive one of our 'tweets' you can stop following us on Twitter; or if we use another type of social media you can opt-out using that service."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]