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Instant Previews provides a graphic overview of a search result and highlights the most relevant sections, making finding the right page as quick and easy as flipping through a magazine. To use it, click once on the magnifying glass next to the title of any search result and a visual overview of the page will appear on the right.
Now with this preview people here are saying they want to block it. Why?
like going on a dating site with no photo
You'll get ten times fewer clicks
Many pages have their previews generated as part of our regular crawl process. Occasionally, we will generate screenshots on the fly when a user needs it, and in these situations we will retrieve information from web pages using a new "Google Web Preview" user-agent
Probably because they see it as another Google encroachment on their copyright.
So there is no opt-out, really.
Just "an offer you can't refuse".
As we use normal crawling to create these previews (on-the-fly accessing is only used for cases where we don't have recent, complete data from crawling), over time the accesses will be mostly limited to the normal crawling activity.