Can I upload photos to a different google account?

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http://forum.xda-developers.com – So this is the situation: I want to set up a central Google+/Picasa account to which both me and the missus can have full access to and upload/share photos to. If I set up a second google account on our phones, can we directly upload photos to that account without having to log in and out of different accounts? If I enabled instant upload on that account but not on the main accounts, would that automatically upload to that shared account? (HowTos)