6. The method of claim 1 , wherein step (c) comprises: identifying human language(s) of the text message; and ignoring, in the text message, pre-selected separate words in the identified human language.
6. The method of claim 1 , wherein step (c) comprises: identifying human language(s) of the text message; and ignoring, in the text message, pre-selected separate words in the identified human language. 7. The method of claim 6 , further comprising at least one of: calculating the weight factor of the text message as a sum or a normalized sum of weight factors of the key terms identified in the text message based on the identified human language; and calculating the similarity score of the text message as a sum or a normalized sum of similarity scores relative to a plurality of previously identified sample messages in the identified human language.