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Who in the world would use them interchangeably and whyIf there was a way to game more PR, why else?
dissipateslike in a redirect chain, more gaming or bad webmastering; allow three redirects in the path and the link has lost more PR than one redirect.
...chain(s) of ten pages...
Matt discourages chained redirects.... If you can do it in one hop, that's ideal. Google is willing to follow multiple hops... but if you start getting up into 4 or 5 range, that's a little bit dangerous, since Google might decide not to follow all those redirects. Keep it down to 1 or 2 or maybe 3.
Is there a limit to how many 301 (Permanent) redirects I can do on a site?
How about how many redirects I can chain together?
[edited by: Robert_Charlton at 5:26 am (utc) on Jun 9, 2015]
[edited by: brotherhood_of_LAN at 1:42 am (utc) on Feb 26, 2013]
I think the point was more that if a user has a directory of pages that they would like to rename or restructure, how much of the current pagerank is going to be lost using redirects rather than linking to the new pages (with a big red banner) OR if they are planning on moving from one TLD to another, how much PR is lost in the move.
If a 301 redirect leaks PR, I would expect canonical to as well.
PageA with inbound links and 1 outbound link to Page B
PageA with inbound links is 301 redirected to Page B
It is this damping factor that causes a link's PageRank/link juice to decay or dissipate roughly 10-15%.
If you've studied the original PageRank algorithm in the "The Anatomy of a Large-Scale Hypertextual Web Search Engine", the formula is based on a "random surfer" model (yes I know it's changed a lot since then but the basic concept is probaby the same). And the formula has built into it a damping factor ("d") that represents the probability that the random surfer will get bored and navigate directly to another random page rather than click on a link on the current page in their browser. This damping factor is typically set around 85% (or .85) according to the original docs.
Query: Overall, what proportion of 301 redirects give the human user the option of not following them? I mean in actual practice, not in browser-prefs-changing theory.
The only real difference is that instead of PageB being displayed with a single link to PageC and the user clicking on that link in the random surfer model... in the redirect scenario the redirect is automatic and essentially is equivalent to the user clicking on that PageC link.
I liked his saying "my pages will have 10% more pagerank and so more pages will rank". To me that means that your pages do indeed need a minimum PR to rank at all, the floor is no longer zero, if it ever has been.