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We have an app that runs in an iFrame on another site (in a Google+ Hangout). Are the cookies in the iFrame going to be considered 3rd party cookies by this if they match the domain of the iFrame source?

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I would expect so. From the sounds of it you may have to direct users to visit your site directly before this works.

The same issue will likely apply for Facebook apps that run inside of iframes... and I think these days that's all of them.

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