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The +1 Button is only intended to be used on pages that contain all public content. By putting the button on a page we're taking it as an indication from you that this page is public content. This means that we will fetch your page even if crawler directives indicate otherwise.
they are really showing their true colours el-rapido these days.
Just to follow up on the Instant Preview questions.. We fetch the content for Instant Previews (provided it's not cached yet) on demand when the user requests it. When we do that, we need to be able to fetch the page the way that the user would see it, and for that we may fetch content that's otherwise disallowed by the robots.txt file.
but what about the various things I block because I don't want a lot of sort=, pagination=, display= and other types of potential duplicate content cluttering up the joint?
The canonical might help in some cases, but I already have canonical set and I still get crap in the index if I don't specifically block it out. Google is not 100% reliable in this.
the only unbiased answers come from testing for yourself
Now though, with a DB driven site, it is nearly impossible.
except they're pretty much saying you *gotta* use +1 - at least that's what the clients hear.
[edited by: indyank at 6:34 am (utc) on Sep 3, 2011]
Just suppress +1 on pages you don't want in the index.
The question is will they obey webmasters and not crawl what we say don't crawl. The answer appears to be no.