Ma.gnolia.com uses Twitter.com to generate feedback from their community and to get immediate feedback on development and new features. They also use it when they have service disruptions. Instead of having lots of people in the community trying to email notifications when the site is down or something is not working, Ma.gnolia can keep the community up to date on what they are working on, and they can get real time feedback on errors and services disruptions that the community is experiencing.