See this report: http://www.incapsula.com/the-incapsula-blog/blog-2012/114-what-google-doesnt-show-you-31-of-website-traffic-can-harm-your-business
link source: icapsula blog, link article written by Marc Gaffan
Some of this traffic we may not be aware of and is not shown by Google,
polonus
I was interested in their use of the term “scrapers”, which I’d never heard (in this context) before, for processes which perform what we commonly know as harvesting.
Hi MikeBCda,
The term might not been familiar to you, but here is what wikipedia has on it: http://en.wikipedia.org/wiki/Scraper_site
link source Wikimedia
polonus
Live and learn … interesting, thanks.
Hi MikeBCda,
You are welcome. I have been doing that constantly during these seven years out here at the avast support forums, live and learn, and it is an ongoing process.
And then at the end of the day you find out there is still so much we do not know,
polonus
Salut polonus,
It’s like when you take a test. You, generally think you have everything down and expect to get a high grade. However, when you do get your paper back, you see it is lower than you expected. You look at one of the questions and say “How could I’ve got that one wrong?”
Well, I think that the human can’t focus so much on a certain test, and if the attempt is too much, losing control over your instincts is common, thus you might make the mistake or two (even more) during a test.
OR after the test you understand the subject a little more. 
This is common to me when I take French class.
I used du instead of de, le instead of la, and so forth. But you learn and move on, not making those mistakes again.
Au revoir,
~Donovan