Imo it is not possible for google to detect properly spun content, it is not worth computing power it requires. They can do this using ngrams for example, but it is uses a lot of queries. And for example article spinner I coded beats this algo, so google cant detect that the content is spun. Manual spinning is also good but it takes more than 30 minutes per article.

Spinrewriter has a decent Google pagerank and bad results in terms of Yandex topical citation index. We found that Spinrewriter.com is moderately ‘socialized’ in respect to Facebook shares (20.2K) and Google+ shares (41). According to MyWot, Siteadvisor and Google safe browsing analytics, Spinrewriter.com is quite a safe domain with mostly positive visitor reviews.

This will no doubt seem very obvious to many people and for others it will send a shudder of fear down their spine! But if you want to make money online, be an affiliate marketer or a well known blogger, then there really is only one way to do it. The best way to get ranked and make money online is to do must things manually. Sure, there are legit shortcuts and additional tools that can make the process faster. But in general if you are looking to create content for your website, then you need to learn the correct way of doing it.
The instant article spinner or paraphrasing tool carefully scans the article you enter, looking for all the words that it can replace with synonyms. All the words or phrases that will be replaced are colorfully highlighted to make them prominent and easy to identify. By clicking on each of the highlighted text, you can see the original word along with other suggestions, and you also have an option to add your own word. To restore the original text, just click the original word. 

A long time ago right now there lived a boy. He had blue eyes with blond hair as yellowish as gold. The young boy was small and fragile, but his mind was swift just like the wind. He could calculate the outcome of any situation in the blink of an eye. But that had not been his biggest talent. No. His biggest skill was perception. The young boy could understand and perceive anything quicker than anyone he previously ever met. Then, he fell in love with a beautiful princess. She acquired magnetic green eye and light brown locks. He loved her quite definitely and she loved him back more even. There was only 1 problem – the young boy was the son of a blacksmith. The princess’s father could not allow her to marry a straightforward child of a blacksmith. But their love was too strong. In one fell swoop, the young boy raised an army of undead and began a rebellion to overthrow the evil king who did not believe in true love. After months of fighting against the armies of his beloved’s father, the youthful boy was assassinated and the battle was over. No songs were sang.
It looks like the creators of Spin Rewriter 9 .0 have really put a lot of work into creating a piece of software that creates readable content. However, Google isn’t stupid and there are a lot of things that can go wrong when you are trying to “manipulate” Google into giving you more traffic. Google hates spam, badly written content and duplicate content. These are all things that Spin Rewriter 9 .0 is capable of creating. You simply can’t trust a piece of software to write content for you in my opinion.
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