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I thought Goolge+ does not yet have a write API. How come Flipboard supports in-app-sharing to Google+ from the iOS app?
Mike Lewis's profile photoKevin Darty's profile photo
I thought G+ gave Flipboard special permissions and will do it on a case by case basis for now. 

I could be way off base.
Yes, Google opened up their new API to Flipboard and I believe they are in talks with a select few others. This happened during Google I/O.

If I recall, Flipboard is basically a beta tester for the new API and it should be opened up to everyone soon.
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