11. The method of claim 3 further comprising: collecting a plurality of first outputs in a second time interval that comprises multiple first time intervals; selecting a plurality of seed tokens; forming a plurality of soft clusters of text messages in which all the text messages in a soft cluster have the same seed token, each of the soft clusters has a different seed token, and some of the text messages are in more than one soft cluster; reducing the number of soft clusters by eliminating some soft clusters that are less dense than other soft clusters; eliminating duplication of text messages so that each text message is found in only one soft cluster; and agglomeratively merging the soft clusters to produce a second output of clustered text messages.
22. The method of claim 11 wherein soft clusters are agglomeratively merged on the basis of similarity as determined by the cosine similarity.