6. The method of claim 1 , further comprising computing, by the computing device, a measure of keyword similarity for the keyword, based at least on the one or more keyword characterizations for use as proxies for the keyword.
6. The method of claim 1 , further comprising computing, by the computing device, a measure of keyword similarity for the keyword, based at least on the one or more keyword characterizations for use as proxies for the keyword. 7. The method of claim 6 , wherein the processing comprises generating, by the computing device, a spectrum of n-grams, and the measure of keyword similarity is computed by taking a dot product of the spectrum of n-grams and weighing each n-gram based on an inverse frequency of that n-gram.