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

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.