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?
2 Answers
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.
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.