14. The method of claim 7 , wherein determining the second similarity relationship comprises: using a semantic graph representing relations between words to compare words of the text cluster and words in the determined text subgroup; and using the comparison to link the determined text subgroup with the text cluster.
15. The method of claim 14 , further comprising generating the semantic graph using at least one of pre-generated summarization of the electronic text, metadata of the electronic text, semantic analysis of the electronic text, semantic indexing, natural language processing (NLP), and statistical techniques.