Bookmark: if I find a post that's interesting and I think I might use it later then I'll bookmark it.
digg/reddit: If you find a post thats interesting then you can "digg it" so that others can view it and either agree (digg) or disagree(bury) with you.
"Digg is developing a smart suggestion system that will consider the type of stories a user has dugg previously then suggest similar stories based on that history."
Though I'm still pretty new to news.YC, I think another appropriate and parallel question is this: Does news.YC want to be Digg?
I've seen quite a bit of replication of content across news.YC/Digg/Reddit. Can't we pretty much assume that news.YC readers also peruse Digg and/or Reddit aswell? I do.
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