I’ve been playing around for a few days with fluther.com, which seems to me to be a sort of useful Twitter. Log in and post a question, and Fluther matches the question with people whom its AI has deemed to be experts. Q&As all seem to be short and to the point. I haven’t used it yet for a personal question, but I note that the answers I’ve read all seem to be accurate, and most of the time people beat me to writing the brilliant response I would have had. Might be a very useful site, especially if the userbase hits critical mass and we start seeing Twitterific-style adaptations to make it more integrated into the desktop experience.