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[edited by: tedster at 3:07 pm (utc) on Jul 26, 2010]
I do have my own viewpoint on this, but it's pretty much based on a feeling built up over time, rather than coming from a disciplined test.
backlinks from blogs and forums will usually lose value over time because they come from pages that gradually get pushed deeper into the site
[edited by: Webwork at 4:04 am (utc) on Jul 26, 2010]
the algo simply stops giving weight to a link that isn't there anymore!
...I would consider a bit of link building for that permalink...
Secondary links to a blog or news article can help keep them from fading... but if these secondary links are also from blogs or forums, they too will fade.
Is the mere "pushing down" of archived articles by the system a signal?
its a bit dumb really, i think, if they downgrade links based on their age.
Consider the example of a document with an inception date of yesterday that is referenced by 10 back links. This document may be scored higher by search engine than a document with an inception date of 10 years ago that is referenced by 100 back links because the rate of link growth for the former is relatively higher than the latter.
While a spiky rate of growth in the number of back links may be a factor used by search engine to score documents, it may also signal an attempt to spam search engine. Accordingly, in this situation, search engine may actually lower the score of a document(s) to reduce the effect of spamming.
" For some queries, older documents may be more favorable than newer ones. As a result, it may be beneficial to adjust the score of a document based on the difference (in age) from the average age of the result set. In other words, search engine 125 may determine the age of each of the documents in a result set (e.g., using their inception dates), determine the average age of the documents, and modify the scores of the documents (either positively or negatively) based on a difference between the documents' age and the average age. "
like a fine wine or do backlinks age more like bread, getting moldy and finally becoming so decrepit and stale that they are no good at all.