5 Ways To Reduce The Chances Your Pages Won`t Get The Duplicate Content Penalty - There is no...
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There is no percentage threshold to say what will be considered duplicate content.
Why? First remember these search engines index and crawl billions of PAGES. They aren't comparing one or two pages to each other. They are taking a sampling of data from many many sites and comparing them all.
They check things like...
1. File Name
2. Directory Name
3. Domain Name
4. IP Addresses
5. Incoming Link Text
You can see what the spider actually takes from your site by going to google and typing in site: www.mysite.com and then clicking on the "cached" link at the end of the listing and then click "cached text" at the top of the page that loads.
Google claims to do about 100 different things to determine a pages listing result (PageRank, Keyword Density, incoming links). So to end up with duplicate content you're going to have to set off more then one flag.
And there are a few other factors to consider. Such as the first part of the page as being more important than the lower content.
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