I had a question about the acceleration of the Logitech m510 mouse, so I Googled: logitech wireless mouse acceleration m510 And this was the first result: Now have a look at the text that shows in the preview for that page. Specifically notice the word "acceleration." Notice how it is in the middle of the sentence "... you can change the pointer speed and acceleration, turn on point trails..." Have a look at that page: http://www.logitech.com/en-us/mice-pointers/mice/wireless-mouse-m510 Just use your eyes for now. Do you see the word "acceleration" anywhere? No. Do you see the rest of that sentence anywhere? No. But maybe we missed it, so let's do a "find" on it! Notice the search box does not turn red. THAT MEANS THE SEARCH TERM IS ON THE PAGE! But it doesn't take you to the term. How strange! Let's look at the source code: Well look at that, the text actually is on the page, it's just not shown to human visitors. This webpage is showing text to the search engines that it is not showing to human visitors. Isn't this SPECIFICALLY prohibited in Google's TOS? I mean, I know YouTube does it all the time, but Google owns YouTube so you would expect that. If Google wants us to play fair then it should be impartial. Here you have a website breaking Google's rules and still ranking #1.