Interesting idea. Can people can use delicious to sort of do the same thing? I think at least for now, you should have it post-through to a person's twitter/delicious/facebook. I have followers on twitter that might be interested in my links, but if I post them on howl, no one will see it (because you just started and there aren't too many users). It's also better than twitter because it pulls images and text like Facebook does. Pownce also did this type of thing, so learn from their experience. Good luck!