1. A computer-implemented method, comprising: identifying, at a server, a plurality of sites, each of the sites hosting a respective plurality of documents; accessing, at the server, usage information associated with each of the plurality of sites, the usage information including, for each site: a frequency of visit value based on a number of times the documents hosted by the site were visited during a time period; and a unique visit value based on a number of unique visitors to the documents hosted by the site; determining, at the server, for each site, a usage score from the frequency of visit value and the unique visit value for the site; and determining, at the server, an organization for the documents based on the usage scores for the respective sites hosting the documents.