From how the multiplayer and cooperative play sounds, it sounds like journey but on a larger scale. You will gradually meet people on your adventure without noticing the game is sharing your worlds. I'm guessing once you enter those hubs where you meet people you can share contacts with one another . From what i read there is no main menu system or menu system. So i'm guessing those type of systems will work in the hub or areas where you can trade an meet people, compete with another or see your progress. But you can only see it in those areas. Besides competing with others i'm thinking that once you share contacts there will be some sort of item in-game thats on your person, that allows you to keep in contact with your freinds and your able to track them like outside of the hub. As for a teleportaition system i could see one working if your on the same planet, and trying to get to a certain area fast enough. Like i remeber seeing a portal in one of the vidoc's so maybe those are one of those teleportation systems.