This is a far too limited WiFi functionality. I still wait for the first manufacture to have an Open WiFi API to let others develop a full control applications.
Something like the Olympus OM-D E-M5 with the following adjustments: 1. WiFi - Full control over WiFi with documented SDK for personal development of Applications for iOS, Android and Windows...
The solution is keep sharing posts with our friends using their Gmail account. Moreover, once you show someone how great Google Hangout is, they will go for it.
For me this is the most important thing in my opinion: "The record of which posts you've read will now be stored on our servers, not in your browser, so the read status of threads will be correct...