[{'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: At times, we will provide you with the opportunity to opt-in to receive promotions, products or services from third-party sponsors. With your permission, we will periodically send to you, via e-mail, offers and promotions from our third-party sponsors which we select based upon your interests or user account. In this case, we do not share your information with the third-party sponsors - we do the e-mailing for them. You will always have the opportunity to opt-out of receiving future offers by following the unsubscribe link included with each of our e-mails. In other instances, we provide you with the opportunity to receive products and services directly from specifically-identified third parties through the Services. In these instances, you must explicitly consent to receive each offer. When you explicitly agree to receive offers from specific third parties, your information is shared with those specific third parties to enable them to provide you with the offer you have requested. We are not responsible for the information collection practices of these third parties, and all information provided is governed by the privacy policies of these third parties. You should review the privacy policies of these third parties before supplying personal data to them."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]