Guys, could someone tell me whether links from hubs give MUCH more value than links from other (non-hub) sites? Thanks
What are hubs? I guess it depends how good the hub is and whether its trusted by search engines more than links from another site.
What are hubs? Oops... Well, AFAIK (this is a VERY rough approach) for each vector term Google divides all related sites into hubs and authorities (and tends to show better authority sites higher in SERPs). The algorithm computes two scores for each document: a hub score and an authority score. Documents that have high authority scores are expected to have relevant content, whereas documents with high hub scores are expected to contain links to relevant content. A document which points to many others is a good hub, and a document that many documents point to is a good authority. Transitively, a document that points to many good authorities is an even better hub, and similarly a document pointed to by many good hubs is an even better authority.