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On the Yahoo! Search preferences page, the "Type" column indicates how each Enhanced Results module was enabled.
A few of the Enhanced Results modules have been turned on automatically in order to give all of our users a chance to experience Enhanced Results. These sites were chosen based on their broad range of appeal to most users. A site which has been automatically enabled will be listed as "Default" in the "Type" column.
For most sites, Yahoo! Search users will have to manually enable the Enhanced Results modules. Modules which have been turned on by Yahoo! users will be listed as "User Selected" in the "Type" column on the Yahoo! Search preferences page.