Hi gracetog,

There is no mystery to what duplicate content is, it is just what the words imply, the same information repeated in multiple places. Any thing that you think may be duplicate content probably is duplicate content. That includes syndicated articles, blog posts, duplicated directory listings, etc. You name it, if it is found in more than one place it is duplicate content.

And yes, in the eyes of Google and virtually everyone else, it IS duplicate content. The Good news is that Google does not penalize your website for duplicate content. They may decide that your entire webpage is duplicate content and they may decide to not index it, or may include it in the supplemental index and you may not receive any ranking benefit from duplicate content. However this is not the same as a penalty. For the most part Google will filter duplicate content from SERPs and that's about it.

There are other types of duplicate content that many webmasters seem to be unaware of, primarily canonicalization issues. That is where the exact same webpage is referenced by multiple URLs.

For example the following URLs may all resolve to the same document:
http:// www . domain.com/
http:// domain.com/
http:// www . domain.com/index.html
http:// domain.com/index.html

In the eyes of search engines these are viewed as separate documents and thus duplicate content.

There are many that do not believe that a duplicate content penalty exists but I have found opposite. This is a sticky issue.

well basically a duplicate content is when an original content is being copied. And also for those articles that are re-written and they are 60% different from the original content are still considered as duplicate content.

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Dupe content more likely to get nailed real content victim, which is exactly the same page more than once. creation date of the move is not possible, so that the content is likely to be fooled removed from PR, or other elements of mathematics. First found could also act, although perhaps not always very responsible for the original work.

Duplicate content is very common on the web. It is presented in the form of distributed content, reflecting, scraping content, quoting, reusing content, data, links, etc. Generally duplicate contents are used by web spammers.

Duplicate content has been and always will be a natural part of the Web. It’s nothing to be afraid of. If your site has some dupe content for whatever reason, you don’t have to lose sleep every night worrying about the wrath of the Google gods. They’re not going to shoot lightning bolts at your site from the sky, nor are they going to banish your entire website from ever showing up when someone searches for what you offer. The duplicate content probably won’t show up in searches, but that’s not the same thing as a penalty.

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Which of these do you want searchers to read?

How pleased will searchers be if they read one and it links to another that is exactly the same?

What is the point?

If all these duplicate pages have the same link text you will dilute your link juice for that particular link text. This, in my mind is the best reason for insuring that a particular link text all go to the same page and not different URLs.

For example, forum posts will often quote large blocks of text repeatedly or re post articles from other sites. Most search engines won't target forums for duplicate content because they also produce so much original content.
At one time it was possible to fool the search engine by keyword stuffing the content of your page; this is no longer the case, as the algorithm can detect such measures. The people at Google are no fools and they have developed their algorithms to weed out fraudulent content. Content that is appreciably the same could be construed as duplicate content, as could other "black hat" techniques like creating other pages that contain the same content purely for the purposes of manipulating search results.

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of course there is a duplicate penalty
if you have 11 sites that have the same title "how to fry an egg" one of the 11 is going to not make it in the top 10 on Google for "fry an egg"
that is the duplicate penalty

Duplicate content is common on web. duplicate contents are used by web spammers.

I have a question!

If I have 2 sites, then upload a same article on each of them, just with a very small change like the order of the sentences, phrase using, etc.

The 2 sites are of big different importance, eg. A is very important, B is less important, and of course the article on site A will be reflected and found by google faster than site B, what will google think? site B is a duplicate content or site A?

Can anybody skilled in this area can tell me about that, tks

There is not a singel shred of evidence that google punishes duplicate content.

The internet is about user experience. If your site is full of junk content people aren't really going to visit you much anyway.
People visit sites to have questions answered, problems solved. A lot of good sites have a news sections, where they aggregate reviews and articles for their readers. This "duplicate content" doesn't hurt them.

well its really good that Google doesn't penalize for duplicate content but they may hide it in the search

Just dnt get caught stealing other webmaster's content for personal gain that's where penalties come into it.