10. The method of claim 3 , the generating a negative usefulness prediction value further comprising: determining the negative usefulness prediction value using a product, P, of a feature vector that identifies the features extracted from the given URL and a weighting vector that includes a weighting for each of the features extracted from the given URL to generate the negative usefulness prediction value using a formula: 
 1−[1/(1+e −P )].
3. The method of claim 1 , using the one or more features extracted from the given URL and the usefulness prediction model to generate the usefulness prediction in connection with the given URL further comprising: generating a positive usefulness prediction value in connection with the given URL using the one or more features extracted from the given URL and the usefulness prediction model; generating a negative usefulness prediction value in connection with the given URL using the one or more features extracted from the given URL and the usefulness prediction model; and comparing the positive usefulness prediction value with the negative usefulness prediction value to generate the usefulness prediction in connection with the given URL.