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I'm considering a campaign for my existing customers that would offer them a discount on products when they +1 our site. Is there a way to prove that someone has +1'd our site?

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probably not, see webmasters.stackexchange.com/questions/17281/… – joshuahedlund Jan 17 '12 at 18:48
I hope there is no way. – martinstoeckli Jan 17 '12 at 20:22
up vote 1 down vote accepted

For my purposes the identity of the person isn't as important as proving that the action was taken. Google offers a callback function which I've used to show a confirmation "promotion code" via ajax.

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If they are using a public google profile, then their +1's can be viewed. I can still see mine when logged out on my profile page.

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