Well, I have some unfortunate news for you: to my knowledge, not one single Facebook Chat app allows this. There is no market. It is beyond wishful thinking to expect Ubuntu to turn this around.
Exactly, there is no market for real privacy and openness, and it certainly is not in Google's or Apple's interests.
That's why I count on free software to close the gap. Free as in: free of corporate interests, no need to make money, no need to provide access to intelligence agencies. I pay for the hardware, and I pay to transmit data. But the data stays mine.
Well, it depends on whether they're planning to build a Facebook Chat app, or a Chat app that supports Facebook (like the previously mentioned Pidgin). The document is just a use case map, not a proposal for any specific application.
