1. A method for extracting semantic information from text data having metadata associated therewith, the method comprising: selecting an ordered set of scale values for a plurality of scales; for each scale value, determining at least one subset of metadata related to the scale value; for each of the scales and associated subsets, determining a statistic on occurrences of content associated with the metadata in each subset; aggregating the statistics for each scale and associated subsets to determine a semantic level for the content; and determining the scales and associated subsets having content with a semantic level above a threshold value.