1. Google Wave, 2009
Promoted as the future of online communication, Google Wave promised to allow users to collaborate and edit work in real-time. Google said its mission was to combine the virtues of email, social networking, and instant messaging. It did neither of the three. Though a platform that could have turned into something with a little more refinement, Wave flopped. When used the benefits seemed minimal, partially because there were no users. Google wised up and cancelled development a year later.