[{'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: Google, as a third party vendor, uses cookies to serve ads on our site. Google's use of the DART cookie enables it to serve ads to our users based on their visit to our site and other sites on the Internet. Users may opt out of the use of the DART cookie by visiting the Google ad and content network privacy policy."}, {'role': 'assistant', 'content': 'This clause is unfair. The privacy practices mentioned are: Identifier_Cookie_or_similar_Tech_3rdParty.'}]