8. A device comprising: one or more processors; one or more computer-readable storage media comprising computer readable instructions which, when executed by the one or more processors, perform operations comprising: ranking individual clusters using an entropy measure on mapping words associated with the cluster, the entropy measure incorporating sentiment values associated with the mapping words, the clusters being associated with microblogs that are to be summarized, the mapping words being mapped from words appearing in a word dictionary, the word dictionary being comprised of individual words processed from multiple resources; summarizing each cluster's content; and displaying the summary on a display of the device.
8. A device comprising: one or more processors; one or more computer-readable storage media comprising computer readable instructions which, when executed by the one or more processors, perform operations comprising: ranking individual clusters using an entropy measure on mapping words associated with the cluster, the entropy measure incorporating sentiment values associated with the mapping words, the clusters being associated with microblogs that are to be summarized, the mapping words being mapped from words appearing in a word dictionary, the word dictionary being comprised of individual words processed from multiple resources; summarizing each cluster's content; and displaying the summary on a display of the device. 14. The device of claim 8 , wherein the ranking comprises: computing probabilities of mapping words, wherein a mapping word's probability incorporates an associated sentiment value; and computing entropy measures that take into account probabilities associated with the cluster's mapping words; and further comprising weighting computed entropy measures to reduce the entropy of at least some clusters.