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I'm working on a site with multiple authors, and am trying to set up Google authorship via rel tags. Since it's a multi-author site, the links to the authors Google+ profiles will be on their profile page. However, the profile page allows them to have links to Facebook, Twitter and LinkedIn profiles as well. My question is, if I add rel="author" attributes to all these links, will Google still parse the authorship information? Or do I need to set it up to only have the rel="author" attribute on the Google+ link? Thanks for your help.