1. I think Google answered my question here http://www.google.com/webmasters/+1/button/
    Can I place multiple buttons on a single page that all +1 different URLs?Yes, but you’ll need to edit the button code. Use the href attribute to specify the target URL. For example, if your home page has a module linking to your blog, and you want to add a +1 button to that module, edit the value of the href attribute to point to your blog’s URL, like this:

  2. Have you any idea what happens if you have multiple instances of the +1 button on the same page?
    I’m asking because we might put it in the header, that appears on every page, and also somewhere in the body of certain pages.

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