Abstract: A dynamic listings catalog may be generated from a plurality of auction listings to allow a more robust user experience in viewing these catalogs, a more personalized grouping of ecommerce items, and facilitate rendering and embedding within a third party website. A listings catalog is defined as a compilation of ecommerce listings within a rich media environment and does not require page-by-page loading of listing sites as a user sequences through them. One natural consequence of the ability to dynamically group and catalog listing sites is that micro-communities may be developed. A micro-community is defined as a group of users (either sellers or buyers) that share one or more commonalities and that are integrated together to facilitate ecommerce within the grouping.