indyank - 5:16 pm on Sep 2, 2011 (gmt 0)

Now this one is interesting.I just found this answer from a google employee in one of their forum threads - [google.com...]

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.

What is interesting to me is until now,i was thinking that if you block a page in robots.txt, google wouldn't even crawl it. But it looks like google will fetch the page, see whether it has a +1 button and then disregard the robots.txt block. Wow, this is great!

Looks like Googlebot will get into every corner of your site.