1. A computer method for storing information in a computer system having at least first and second computers for retrieval and display based on similarity of information, the method comprising: a first-tier program module operating on a first computer for determining a new document vector to characterize a new document for comparison of a similarity of the new document to other documents stored in the computer system; the first-tier program module transmitting the new document vector to a second-tier program module operating on a second computer in the computer system; the second-tier program module transmitting a similarity value to said first-tier program module which represents a comparison of the new document vector to at least one composite vector characterizing a similarity of a plurality of documents stored in the computer system; and based on said similarity value received from said second-tier program module, said first-tier program module determining whether said new document should be transmitted to said second-tier program module for storage in the computer system.