My website *not my Hub .. is being plagiarized all the time by lots of people. Sometimes they do it only hours after I have uploaded a new page. I can see this going on in several ways and the first method is to check my statistics to see unusual numbers of visits from certain IP addresses and the second way is to spend several hours searching for paragraphs (not keywords) of your text in Google. Some sites are even copying my whole website and using a cloaking technique to show the website content to search engines while delivering different pages to the public (one of them is a supposed charity website)
The most popular plagiarists are people who are bi-lingual or multi-lingual. What they do is translate your pages and use them for material on a website in another language.
I see some people start whole new websites by copying my content on sacrificial websites which are straight copies of pages from my site. They do this because they want to see which pages are becoming popular. Once they have found this out they will close down that website and use the research data material (plagiarized and modified) to start a new website that has unique content but it is actually copied and modified from my site but Google will see it as unique content.
Most people don't know how to identify this activity because they are unfamiliar with how to use web statistics /analysis programs. Believe me, the people are copying stuff from anything that is good so my policy right now on new websites is to upload low quality material for 6 months to a year and see if it can get out of the google sandbox (the sandbox is a program that quarantines your site and does not allow it to be popular for a while) If you are uploading your best stuff all the time I wish you luck because you will need it.
Once your site is out of the sandbox and you see that Google spiders are visiting your pages much more frequently you can then start updating with higher quality material because you might be lucky and see Google spider your new pages before the cheaters have copied it and uploaded it to their other site that has higher page rank.
The moral is "Don't upload your best stuff to your site until you have a lot of Page Rank and can see that Google is spidering your site more frequently"