dstiles - 10:34 pm on Jul 2, 2011 (gmt 0)
Bounce rate is not something that can be reliably measured.
I will often click on a search result, leave the response in a browser tab if it is useful/relevant and then go back for another one, action ditto. It all depends on what else I'm doing at the time, how long I need the result for, how long before my wife comes back so I can show her...
I have some pages open in browser tabs that I first opened months or even years ago after finding them in an SE. Some of them I click on several times a day (eg robtex), and others maybe once a week. How is any search engine going to determine MY usage and bounce rate without intercepting my browser clicks and data fetches (which is technically illegal anyway in many countries).