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Thanks for your posting. It is really useful.

Chris,thanks for sharing this useful post.

i think many Dc in the google but not realy to index may be has any edditing with owners

We give the power to Google because they are the mountain and we are all just little ants on the side of the mountain.

harry rubinstein at yournetbiz
yournetbiz video

What a load of crap coming out of Google what about RSS xml feeds how many sites use the same feed is that NOT duplicate content?

Google is only good at one thing scare tactics

1 SandBox scare tactics (Not to optimize Sites) No Such thing

2 Cloaking (10 years not detected) catch if you can

3 Looking at CSS simple

# All Bots Disallow
User-agent: *
Disallow: /CSS/

All rubbish

They want me to add nofollow here, canonical there, according to rules they never clearly explain because they don't want us to figure out their algos.

Nonsense. My job is to create content, Google's job is index and rank that content. I don't ask Google to create content, they don't ask me to help index and rank the web. If they wanted my help, they would clearly state what they want me to do, like: "Nofollow your category and tag URLs in Wordpress blogs", "add rel=canonical to product search pages in your OS Commerce store" and so on.

To 99% of bloggers and editors out there, statements like "detection of recurrent URL patterns (the ability to 'learn' recurrent url patterns to find duplicated content)" is meaningless.

In the first place, Google lies to everyone on a regular basis. Every time I've tried to implement the latest "you gotta do it this way" statements from Google I've gotten burned.

I've given up paying any heed to their statements and my primary site continues to be #1 in their results solely because it's aged in.

As for site maps, I have sites with and without them. I see no benefit at all. As near as I can tell, site maps are basically useless. With or without them, the spiders still need to crawl and follow the links to index the content.

Most important though, what right does Google have to dictate to publishers what content is on their sites, how that content is organized, or how many times it might appear? In sales, repetition is often the most important element to making a sale. You need many pages to present much of the same information to reinforce your message to readers and to reach different market segments. We don't all have Google's billions of dollars in marketing money or the ability to have the media write a story every time we sneeze. Google's actions equate to an unreasonable restraint of trade.

Personally, I think some greedy enterprising law firm should file a class action against Google and demand that they either 1) specifically state clearly and openly what their indexing methods are; or 2) index everything and exclude nothing.

Their "not evil" motto is just marketing crap. They are just as evil as all corporations that get a little too big and think they can dictate to the world for the benefit of nobody but themselves.

I don´t speak english. Minha intenção é só divulgar meu site. Passo o dia cadastranto em mecanismos de busca. Acretido que esses mecanismos que cadastram em varios sites,me fizeram duplicar o conteudo,no Google....Não tive nenhuma intenção de fazer isso, a minha falta de conhecimento que levou a isso.

What constitutes duplicate content? Is there a percentage of similar content that is then tagged as duplicate content? and how important is it, if it is on the same website? For example, you write original content for something like "golf shoes" . Then you write another page for "ladies golf shoes". What percentage of the content must be different?

Thanks! This was indeed very informative. The issue of duplicate content is a serious one. Often you end up being a culprit even when you did not intend any malicious tricks.