[{'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: Bing Experience Improvement Program for Bing Desktop and Bing Toolbar. If you are using Bing Desktop or Bing Toolbar and choose to participate in the Bing Experience Improvement Program, we also collect additional data about how you use these specific Bing apps, such as the addresses of the websites you visit, to help improve search ranking and relevance. To help protect your privacy, we do not use the data collected through the Bing Experience Improvement Program to identify or contact you, or target advertising to you. You can turn off the Bing Experience Improvement Program at any time in the Bing Desktop or Bing Toolbar settings. Finally, we delete the information collected through the Bing Experience Improvement Program after 18 months."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]