3) So if I want to send money (from say GBP) to someone in Japan, what would happen? Is the FX exchange seamless or will I need to use some intermediary coin?
3) That's a complicated answer that involves more than just the blockchain (as you need to convert fiat from/to digital currency) so it depends on the VASPs (the wallets) not on DIEM.
However, Facebook makes extensive use of shadow profiles of people who aren't even Facebook customers. They could certainly add Diem blockchain data to those, as they will have access to said blockchain via Novi, their Diem wallet.
David Marcus and Mark Zuckerberg have both stated that data from Novi will not go to the Facebook advertising engine. However, Zuckerberg and Facebook's track record on such promises is that they consistently do this anyway. Then Zuckerberg apologises, then he does it again.
Just by looking at Facebook's past behaviour, you can assume that an important purpose for Diem is to collect personal information. Because everything they do is to collect personal information.
That being said, there is a lot of work being put in making sure that FB doesn't have access to Novi user data. Of course, sometimes one employee's mistake can lead to infringement of a claim, so to avoid that good frameworks have to be put into place.
As I understand, that number is presently zero. (Please correct me if I'm wrong on this.) And unhosted wallets won't be allowed - all consumers will need to transact via a Diem Association member. So Diem usage really is 100% Novi for the known future.
Are you really really sure that some of the things Facebook (and Google) does aren't done just to spite us ;-)?
2) it is tied to non profits as well! The whole point is to fund this project by companies, no a company
3) we will support single currencies (a USD coin, for example)
4) that’s what we’re working on!