5. The method of claim 1 , wherein determining the set of member groups further comprises: clustering the target members into one or more member groups based on the messages posted by each of the target members using the advertising targeting server system, where target members within the same member group express similar intents based on the messages posted by the target members in the same member cluster; associating at least one member who is not a target member with each of the member groups based on relationships between the at least one member and the target member within the online social network using the advertising targeting server system; predicting the interest level with respect to the advertising content of each of the member groups based on the messages posted by the target members in the member group using the advertising targeting server system; and estimating the connectedness of the member groups based on the members in each of the member groups using the advertising targeting server system.
5. The method of claim 1 , wherein determining the set of member groups further comprises: clustering the target members into one or more member groups based on the messages posted by each of the target members using the advertising targeting server system, where target members within the same member group express similar intents based on the messages posted by the target members in the same member cluster; associating at least one member who is not a target member with each of the member groups based on relationships between the at least one member and the target member within the online social network using the advertising targeting server system; predicting the interest level with respect to the advertising content of each of the member groups based on the messages posted by the target members in the member group using the advertising targeting server system; and estimating the connectedness of the member groups based on the members in each of the member groups using the advertising targeting server system. 6. The method of claim 5 , further comprising generating an advertising strategy for each of the member groups based on the connectedness of a member group and the predicted interest level using the advertising targeting server system.