watched your video to see if this was something i'd want to use, still have no clue! show a useage case in the video please, not just a bunch of pretty words about the service.
The site is gorgeous though.
We believe this is a really "new thing", so we are trying to avoid forcing an already known interpretation in simplistic terms on the home page, though the standard texts in marketing all say so.
It looks great, but IMHO, you should consider simplifying.
Edit: Forgot to say +1 for the idea, it looks like it could make my bookmarking useful again. Save me from delicious!