Duplicate Content Checker CopyScape
copyscape.com provides duplicate content checking with sites outside your own. The same company also offers siteliner.com which evaluates duplicate content within your own site.
It also does comparisons with other sites giving you feedback on your sites average page size, average page load time, number of words per page, text to HTML ratio, internal and external links per page, total links per page, and inbound links per page.
The site feels a little bit new, and I'm not sure they have all the kinks worked out, but it is an interesting frame of reference and potential tool.
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Yeah, copyscape can be used to determine whether or not someone is copying your content and is a pretty good tool for this (it actually used to be far more useful and accurate years back).
The thing is though, if you are writing unique content yourself it doesn't matter if other people are copying you as their duplicate content is not going to get ranked like yours.
The first to market always reaps the rewards of the rankings, so as you create unique content naturally others and scraping tools will copy your content...but you will always retain the actual ranking in the search engines.
"it doesn't matter .... " >> I thought Google penalized you for duplicate content ? I like your perception about being first better.
'not sure that Analytics identifies duplicate content, inside and outside of your website ... Analytics is almost info overload in other respects unless you totally understand it ... and I don't LOL
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will study this..