YouTube launches Uptime, an experimental app for watching videos with friends

To be clear, the app is also about public sharing, not private messaging. YouTube itself only recently added an in-app messaging feature to its mobile application, which lets you share videos and your comments on them with friends without having to switch to another messaging client or SMS. Uptime is not designed for this private sharing, but is instead a different take on the more public socializing that takes place around video content. – Sarah Perez, TechCrunch