This podcast episode discusses the rise of Blue Sky, a new Twitter-like platform built on the AT protocol. Blue Sky allows users more control over their data and privacy, as they can create their own instances of the service and use their own domain names as handles. Blue Sky is still in its early stages of development, but it has quickly gained traction, especially among developers. While it faces challenges such as a lack of video and GIF support, it has the potential to be a more flexible and customizable alternative to Twitter.