Read this post: Code: http://www.webproworld.com/webmaster-forum/threads/117356-So-Who-wants-the-Google-Scoop-of-the-year I've used HPS on two of my websites, and didn't receive any unnatural link warning on any of my websites. And I didn't do any blog commenting that wasn't approved. I wouldn't put it past google to attain the information about Akismet about sites that were moderately or excessively marked as spam. They already have APIs for twitter and facebook as far as I know What do you guys think? Does it match up with your backlinking strategy?