6. The method of claim 1 , the instructions configured to, upon receiving the at least one topical category associated with the content item from the human classifier, deliver a reward to the human classifier.
6. The method of claim 1 , the instructions configured to, upon receiving the at least one topical category associated with the content item from the human classifier, deliver a reward to the human classifier. 13. The method of claim 6 : the device defining a reward limit of rewards provided to human classifiers; and the method comprising: selecting for sending to human classifiers the content items associated with rewards having a reward total not exceeding the reward limit.