I’m happy to announce the launch of GroupTweet, a service that allows Twitter users to send private messages to specific groups of friends. This is a small project that I threw together to fill a feature-gap in Twitter that always bothered me: why can’t I send status updates to specific groups of followers? GroupTweet allows small groups of people to send updates to each other without those updates appearing on their public time lines. Check it out and let me know if you have any feedback!