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I'm having trouble really understanding exactly HOW it is that outbound links help you. I have tons of them as part of my site is an index. But I've moved away from posting outside-site-bound links from my top several layers. I've done this to emphasize some pages rather than to keep PR inside my site. Now I'm wondering if every single blessed page should have some sort of outbound link.
I don't see anything definitive on Google or elsewhere that specifically says outbound links cause your site to improve in the serps because ... Nor can I find anything that says a lack of outbound links will hurt you because ...
I link to everybody I can as I fully believe in the ideal of a fully intertwined web. Or maybe cause I'm stupid. I guess I see the why of search engines desiring sites that link to others. But I'm just not getting the HOW they actually turn that into value for the linker via the serps. Brett or someone can you help. I don't think pointing to other threads is gonna do it.
And as a related issue, should I only be linking to the top PR sites on my best PR pages? I know they won't link back as they don't link to anyone. Which is part of the reason I'm confused about this. All the top sites in my category don't carry links until you get down 6 or more layers. And these sites are all PR8s at the top level.
Two published methods (hilltop and clever project) describe how to implement "hubs and authorities", where it is beneficial to your ranking, if your page is considered an "authority".
Keep in mind, that I don't know if Google tries to identify authority pages ( using the hilltop or clever definitions, or variations thereof). But suppose hypothetically that they do now partially, or might implement it in the future.
One factor that the hilltop and clever methods share, is that an Authority page must link to at least one other external authority page. ( An authority page appear also must appear on an external "hub" page's lists of links to multiple authorities... plus a few other conditions).
Suppose you wanted to prepare your page for this possible situation. How do you find what is another authority page? Teoma uses a hubs and authorities method. Teoma will show you the major authority pages for your keyword topic, and its Resources list shows you the hubs. So, you could choose one page from Teoma's results (authority pages), link to it, and then try to get one external Resource (hub) page to link to your page. That seems to be the minimum entry conditions for consideration as an "authority".
If Google were to implement a variation of this, they'd probably also mix some PageRank considerations into the algorithm. Anyway, this is all hypothetical, and possibly not currently pertinent to Google.
Ranking by identifying hubs simply doesn't fit into Google. Kleinberg's HITS for example analyzes a subgraph of the web based on actual search queries to identify hubs. This takes quite some time and leads to problems regarding scalability. But scalability was one of the most important things to Larry and Sergey at the time they created Google. At Google, everything is preprocessed. PageRank is computed in advance. And the inverse index does nothing but providing a set of ordered pages for each and every word that is to be found on the web. Implementing any kind of sophisticated hub rank would be inconsistant with one of Goolge's basic principles.
The same applies to Hilltop, although I don't think that Hilltop is really about ranking hubs. It is more like PageRank where only expert pages are considered to calculate "link popularity". Nontheless, there are to many things to be calculated after the query which is one of the weaknesses of Hilltop.
BTW, I use Google because it's fast and the results are good. If I click on the first result and I don't find the information that I want, I go back to Goolge's SERP and check the second result. I don't want to search for links on the pages that Google finds for me. I don't know your search behaviour, but I don't need any hub rank.