Diigo is just a social bookmarking website, like del.icio.us or Google Bookmarks. I'm using it because it has a handy tagging system, and the option to write notes for each bookmark. So if someone just wants to know which Hugo 2016 eligible novellas I liked, they can just select that tag. And later if I feel like it I can add tags like "Irish author", "SF by women", or "Contains Inaccuracies About Growing Potatoes" (I just read The Martian).