A common theme in this blog is Duplicate content
Lets see if we can through some light on how Google actually treats duplicate content.
Google’s John Mueller clarifies a misconception about duplicate content, saying it’s not a negative search ranking factor.
Before someone dives in with questions about Plagarism, that is a completley different topic., covered under copyright laws. We know it happens and if Google found your "stolen" article more attractive than the original pray, that the owner of the original doesn't hunt you down.
John Mueller goes on to say that duplicate content is normal and that Googles algorithims are built to handle it.
Responding to a question from the owner of a car parts site Mueller said it is common for other sites to have the same parts for sale and very similar content.
As an example he pointed to online shopping to quote
"A really common case for example is with ecommerce. If you have a product, and someone else is selling the same product, or within a website maybe you have a footer that you share across all of your pages and sometimes that’s a pretty big footer. Technically that’s duplicate content but we can kind of deal with that. So that shouldn’t be a problem.”
He went on to say
"Google isn’t going to interpret negative signals from crawling a product description that appears elsewhere on another retailer’s site".
How would it affect a blog site?
If entire pieces of content on a site are duplicated then Google will rank one and not show the other. Multiple copies of the same page does not send negative ranking signals.
So if you have a post on another site and you decide it would be a good fit on another of your sites Google ( if asked the question), will just show the one it thinks is the best fit.
Multiple copies of the same page does not send negative ranking signals.
You can see the video at this link.