A method, system and computer program product are disclosed for predicting influence in a social network. In one embodiment, the method comprises identifying a set of users of the social network, and identifying a subset of the users as influential users based on defined criteria. A multitude of measures are identified as predictors of which ones of the set of users are the influential users. These measures are aggregated, and a composite predictor model is formed based on this aggregation. This composite predictor model is used to predict which ones of the set of users will have a specified influence in the social network in the future. In one embodiment, the specified influence is based on messages sent from the users, and for example, may be based on the number of the messages sent from each user that are re-sent by other users.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A method of predicting classifications of users of a social network, the method comprising: identifying a multitude of users of the social network; obtaining a set of historical data of a defined activity in the social network; separating the multitude of users into a plurality of classes based on the defined activity in the social network; identifying a multitude of measures as predictors of which one of the classes each of the users is in; using the set of historical data to determine an effectiveness of each of the measures as a predictor of which one of the classes each of the users is in; and forming a composite predictor model by combining said measures to determine which one of the classes each of the users is in. 2. The method according to claim 1, wherein: the defined activity has a given association with each of the users; and the separating the users into a plurality of classes includes separating the users into the plurality of classes based on a level of the defined activity associated with each of the users. 3. The method according to claim 2, wherein the identifying a multitude of measures as predictors of which one of the classes each of the users is in includes identifying a multitude of measures as predictors of the level of he defined activity associated with each of the users. 4. The method according to claim 3, wherein the obtaining a set of historical data of a defined activity in the social network includes obtaining a set of historical data of the level of the defined activity associated with each of the users. 5. The method according to claim 4, wherein the using the set of historical data to determine an effectiveness of each of the measures as a predictor of which one of the classes each of the users is in includes using the set of historical data to determine an effectiveness of each of the measures as a predictor of the level of the defined activity associated with each of the users. 6. The method according to claim 1, wherein the forming the composite predictor model includes comparing the performance of each of the measures. 7. The method according to claim 6, wherein the comparing the performance of each of the measures includes comparing the performance of each of the measures versus a logistic regression. 8. The method according to claim 6, wherein the comparing the performance of each of the measures includes comparing the performance of each of the measures versus a logistic regression applied to all the measures. 9. The method according to claim 1, wherein: in the social network, messages are sent by and among the users, and some of the messages sent by some of the users are re-sent by others of the users; and the defined activity comprises messages from each user being re-sent by the others of the users. 10. The method according to claim 9, wherein the separating the multitude of users into a plurality of classes based on the defined activity in the social network includes separating the multitude of users into the plurality of classes based on a number of times messages sent by each user are re-sent by the others of the users. 11. A system for predicting classifications of users of a social network, the social network having a multitude of users, the system comprising: a memory for holding data; and one or more processing units operatively connected to the memory and configured for: accessing a set of historical data of a defined activity in the social network; separating the multitude of users of the network into a plurality of classes based on the defined activity in the social network, and wherein a multitude of measures are identified as predictors of which one of the classes each of the users is in; using the set of historical data to determine an effectiveness of each of the measures as a predictor of which one of the classes each of the users is in; and forming a composite predictor model by combining said measures to determine which one of the classes each of the users is in. 12. The system according to claim 11, wherein: the defined activity has a given association with each of the users; and the separating the users into a plurality of classes includes separating the users into the plurality of classes based on a level of the defined activity associated with each of the users. 13. The system according to claim 12, wherein the identifying a multitude of measures as predictors of which one of the classes each of the users is in includes identifying a multitude of measures as predictors of the level of he defined activity associated with each of the users. 14. The system according to claim 13, wherein the obtaining a set of historical data of a defined activity in the social network includes obtaining a set of historical data of the level of the defined activity associated with each of the users. 15. The system according to claim 14, wherein the using the set of historical data to determine an effectiveness of each of the measures as a predictor of which one of the classes each of the users is in includes using the set of historical data to determine an effectiveness of each of the measures as a predictor of the level of the defined activity associated with each of the users. 16. An article of manufacture comprising: at least one tangible computer readable hardware medium having computer readable program code logic tangibly embodied therein to predict classifications of users of a social network, the social network having a multitude of users, said computer readable program code logic, when executing, performing the following: accessing a set of historical data of a defined activity in the social network; separating the multitude of users of the network into a plurality of classes based on the defined activity in the social network, and wherein a multitude of measures are identified as predictors of which one of the classes each of the users is in; using the set of historical data to determine an effectiveness of each of the measures as a predictor of which one of the classes each of the users is in; and forming a composite predictor model by combining said measures to determine which one of the classes each of the users is in. 17. The article of manufacture according to claim 16, wherein: the defined activity has a given association with each of the users; and the separating the users into a plurality of classes includes separating the users into the plurality of classes based on a level of the defined activity associated with each of the users. 18. The article of manufacture according to claim 17 wherein the identifying a multitude of measures as predictors of which one of the classes each of the users is in includes identifying a multitude of measures as predictors of the level of he defined activity associated with each of the users. 19. The article of manufacture according to claim 18, wherein the obtaining a set of historical data of a defined activity in the social network includes obtaining a set of historical data of the level of the defined activity associated with each of the users. 20. The article of manufacture according to claim 19, wherein the using the set of historical data to determine an effectiveness of each of the measures as a predictor of which one of the classes each of the users is in includes using the set of historical data to determine an effectiveness of each of the measures as a predictor of the level of the defined activity associated with each of the users.