Well, we just had one of those "Splat! Coulda had a V8" moments. We didn't realize our clients' e-commerce platform was not avoiding the duplicate urls SEO problem. Here's a quick background on duplicate content and url redirection.
Duplicate URLs
Google hates duplicate content. They also happen to consider http://www.yourdomain.com
completely differently from http://yourdomain.com. So that means you could possibly be splitting your google juice betweent the two domains without even knowing it, making it twice as hard to do SEO work.
Soltuion: URL Redirection
Now, this is not a journey for the feint of technology. If "Apache" and "Mod_rewrite" sound like a helicopter followed by some techno-babble, make sure you hire someone for this.
You'll want to PROPERLY redirect your urls in a way that google can understand. To do this, you'll tell them that the site has
permanently moved to another url. In other words, you'll send google spiders a "301" error. Just like 404 means "not found", 301 means "permanently moved".
Well, in our case, the urls were being redirected, but not using the proper 301 designation. So it
looked like it was working, when in fact we were getting screwed and our SEO efforts thwarted. Even fooled the silly SEO tools that show SEO friendliness.
Moreal of the store: Check google to make sure that "site:yourdomain.com" has the same amount of pages indexed as "site:www.yourdomain.com". If the number is different, you probably have a url redirection problem.
Read More...