[{'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: Sweepstakes and promotions: We may sometimes offer sweepstakes, giveaways, or other promotions from the "Community" pages. In that case, we will use the information we receive for purposes of the promotion and no other purpose. We will never use your information for direct marketing purposes unless you "opt in" on a case-by-case basis. All other terms and conditions applicable to the promotion will be in the official rules that we publish.'}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]