Hubs are a range of centralized websites linking to many related topical Authority websites. Characteristics of a hub are: 1. Many outbound links to sites (typically Authority sites) that contain relevant content 2. The content on the hub site is highly focused A site can either be a hub, an authority, both, or neither. An authority or hub site will get preferential treatment by a search engine algorithm that incorporates topic distillation.
Topical hubs are sites which link to well trusted within their topical community. A topical authority is a page which is referenced from many topical hub sites. A topical hub is a page which references many authorities. See also: Mike Grehan on Topic Distillation [PDF] Jon Klienberg's Authoritative sources in a hyperlinked environment [PDF] Jon Klienberg's home page
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