A method includes defining multiple moderation tasks, which originate from respective textual articles that are to be automatically converted into respective video clips following moderation by human moderators. The moderation tasks are pre-processed, so as to predict success measures of the corresponding video clips. Delivery of the moderation tasks to the human moderators is prioritized based on the predicted success measures.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A method, comprising: defining multiple moderation tasks, which originate from respective textual articles that are to be automatically converted into respective video clips following moderation by human moderators; pre-processing the moderation tasks so as to predict success measures of the corresponding video clips; and prioritizing delivery of the moderation tasks to the human moderators based on the predicted success measures. 2. The method according to claim 1, wherein pre-processing the moderation tasks comprises predicting respective likelihoods that the human moderators will not reject the moderation tasks, and wherein prioritizing the delivery comprises prioritizing the moderation tasks based on the likelihoods. 3. The method according to claim 1, wherein pre-processing the moderation tasks comprises classifying the moderation tasks into two or more classes, and wherein prioritizing the delivery comprises prioritizing the moderation tasks so as to provide the human moderators at least a predefined number of tasks of each class. 4. The method according to claim 3, wherein the classes comprise at least one class type selected from a group of types consisting of clients associated with the moderation tasks, moderator types associated with the moderation tasks, topics associated with the moderation tasks, and textual-article feeds associated with the moderation tasks. 5. The method according to claim 1, wherein defining the moderation tasks comprises grouping at least some of the moderation tasks in moderation batches, each moderation batch containing the moderation tasks originating from a respective textual article, and wherein pre-processing the moderation tasks comprises predicting the success measures per moderation batch. 6. The method according to claim 5, wherein prioritizing the delivery comprises prioritizing each moderation batch depending on a respective number of the moderation tasks in the moderation batch. 7. The method according to claim 1, wherein pre-processing the moderation tasks comprises assessing a newsworthiness of the respective textual articles, and wherein prioritizing the delivery comprises prioritizing the moderation tasks based on the newsworthiness of the textual articles. 8. The method according to claim 7, wherein assessing the newsworthiness comprises assessing at least one property selected from a group of properties consisting of popularity, uniqueness, recentness and trendiness of the textual articles. 9. The method according to claim 7, wherein assessing the newsworthiness comprises quantifying the newsworthiness by analyzing social-network traffic. 10. The method according to claim 1, wherein prioritizing the delivery comprises combining two or more different types of the success measures to produce respective priority ranks for the moderation tasks. 11. Apparatus, comprising: a processor, which is configured to define multiple moderation tasks that originate from respective textual articles to be automatically converted into respective video clips following moderation by human moderators, to pre-process the moderation tasks so as to predict success measures of the corresponding video clips, and to prioritize delivery of the moderation tasks to the human moderators based on the predicted success measures; and an interface, which is configured to deliver the prioritized moderation tasks to the human moderators. 12. The apparatus according to claim 11, wherein the processor is configured to predict respective likelihoods that the human moderators will not reject the moderation tasks, and to prioritize the moderation tasks based on the likelihoods. 13. The apparatus according to claim 11, wherein the processor is configured to classify the moderation tasks into two or more classes, and to prioritize the moderation tasks so as to provide the human moderators at least a predefined number of tasks of each class. 14. The apparatus according to claim 13, wherein the classes comprise at least one class type selected from a group of types consisting of clients associated with the moderation tasks, moderator types associated with the moderation tasks, topics associated with the moderation tasks, and textual-article feeds associated with the moderation tasks. 15. The apparatus according to claim 11, wherein the processor is configured to group at least some of the moderation tasks in moderation batches, each moderation batch containing the moderation tasks originating from a respective textual article, and to predict the success measures per moderation batch. 16. The apparatus according to claim 15, wherein the processor is configured to prioritize each moderation batch depending on a respective number of the moderation tasks in the moderation batch. 17. The apparatus according to claim 11, wherein the processor is configured to assess a newsworthiness of the respective textual articles, and to prioritize the moderation tasks based on the newsworthiness of the textual articles. 18. The apparatus according to claim 17, wherein the processor is configured to assess the newsworthiness by assessing at least one property selected from a group of properties consisting of popularity, uniqueness, recentness and trendiness of the textual articles. 19. The apparatus according to claim 17, wherein the processor is configured to quantify the newsworthiness by analyzing social-network traffic. 20. A computer software product, comprising a non-transitory computer-readable medium in which program instructions are stored, which instructions, when read by a computer, cause the computer to define multiple moderation tasks that originate from respective textual articles to be automatically converted into respective video clips following moderation by human moderators, to pre-process the moderation tasks so as to predict success measures of the corresponding video clips, to prioritize delivery of the moderation tasks to the human moderators based on the predicted success measures, and to deliver the prioritized moderation tasks to the human moderators.