Need more detail? Let me explain: I read Hacker News. Sometimes I up-vote the posts. I wouldn't mind sharing those stories on Facebook, Twitter, this blog, but can't bring myself to make another half-dozen clicks to do so. Call me sharing-lazy. Hacker News is a minimalist/low tech news site, so I don't expect his author to introduce such integration anytime soon. But that should not stop a developer from adding it via greasemonkey script.

Perhaps good folks of Posterous would be interested to supplying such a script that automatically shares up-votes via post.ly?