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Anyone know how Google handles this? If I switch my domain, obviously the old domain will no longer be a valid URL. I assume at some point Google will remove these pages from their system. Do I need to wait until this happens before continuing to advertise on AdWords?
What I'm worried about is that as soon as I change the domain Google bots will consider the new site to have nothing but duplicate content (since the content will be identical to the old site).
I assume that when I setup new adwords ads using this new URL Google will see that the new site is nothing but duplicate content and I'll get horrible quality scores.
Anyone know how this works?
Once I make the change the old domain/site won't even be accessible. I'm sure G will remove all of these URLs from their DB at some point, I'm just not sure how long that will take.
Considering the old domain/site won't exist, I can't really do any redirects. Of course I could leave the old site running somewhere, and do the redirects, but I'm not sure this is the best way?
But is there any evidence that duplicate content is an issue for AdWords quality scores?
Not that I'm aware of. So far I’ve never came across any evidence showing AdWords is connected to regular Google Search from any scoring perspective. I just use my own logics and believe (to a degree) that AdWords would not (at least) go against its sister.
Although not our business, you would help us answer your question better if you tell us why you’re changing domain name.
Were you unsuccessful with the old one so you hope to do it better with the new one?
…or you simply found better name for your site?
Anyway, when you change the domain name, you want to keep your site’s ranking and indexing history, whatever they are, unless you have a specific reason for wanting your OLD site (old domain name) disappear from results.
So, if all ok, you definitely want to implement 301 which means “I moved”. That way, all bots will rewrite their indexes with new site’s URLs.
I am saying all this just to make you aware that with 301, there should be no doubt about duplicated content.
You can actually hurt your new site with not having 301.
301 is the only right way of doing it.
Again, if you are trying to delete the history of your old site (domain name) and hoping that Google will not connect the new one to it, that’s another story.
In regards of index, without 301, it may happen that your old pages never get properly deleted – or stay indexed for long time.
For example, would moderate changes to the top paragraph combined with a few minor text changes to a couple other lower page paragraphs, plus a different external link do the job? Do Meta Tag differences matter? Also, would changes to sub-pages be needed or is only index page editing sufficient?
Can anyone estmate how extensive the content changes need to be? I know we do not know the real answers so am only asking for educated guessing.
P.S. My 'wondering' about this involves several areas including Adwords quality, Adsense and YPN quality scoring, and is applicable to SEO rank too.
My experience also shows that this is applicable to AdWords in regards to Quality Scores, etc. in the sense that if a site has lots of duplicate content if will NOT get a good quality score overall.
In terms of changing the domain, no diabolical reasons ... we just secured a better name and since the site is still pretty new and doesn't have tons of history, links, etc. we are going to change it now.