1. A method of associating a particular host with one or more regions, the method comprising: determining if a top-level domain of the particular host is a regional top-level domain; and if the top-level domain of the particular host is not a regional top-level domain, then determining one or more regions associated with the host based on which other hosts contain documents that reference documents on said host; wherein the step of determining one or more regions associated with the host based on which other hosts contain documents that reference documents on said host includes the steps of: determining a diversity of domains in which there are other hosts that link to the particular host; determining whether the diversity is greater than a specified threshold; and if the diversity is greater than the specified threshold, then associating the particular host with a classification value that indicates that the particular host is of equivalent interest to multiple regions.