Okay, here is what I think about the bookmarklet. Facebook OpenGraph won, everybody supports that, even Mokum. Here is how it would look: you paste the URL here, and click the "Share" button (or "Post" button will ask you an additional question if there is only the URL, and nothing else). Then it does the magic, crawling the URL the same way that Facebook does, extracting title, snippet and images. Then you have a chance to edit the snippet, add your own comment, and finally click "Post" again (waiting for images to be downloaded and processed).