Simple PS4 questions

I asked these questions when Gizmodo was offering to answer anything about the PS4, and of course they didn't bother to check the comments later on.

So, here are my very simple questions:

  • Can you see the same friends list as on PS3?
  • If so, how do you know if they're on PS3 or PS4?
  • Is the messaging any better? Have they made some IMAP-like messaging? The PS3 messaging was sort of like POP3...heck, it might even be POP, but I don't know, all I know is that it's similar.