This is a bookmark-savin' tool sort of like (okay, very like) another popular (but soon to be dead) one.
You should sign in or sign up to get started.
No it's not! You can log in with your Twitter and Facebook accounts, so you don't even have to remember another password (more OAuth services coming soon).
You can import your old Delicious bookmarks, (as well as bookmarks from your browser or any other standards-compatible export) so you'll be up and running in no time flat.
No idea. But it's short. You can make up fun expansions, like "1Roadmap", or "I roared" or something if you'd like.
Not at all! This project is still extremely young, so don't go betting the farm on it yet, but please use it, break it, and figure out what could be done better. Call it an early alpha.