Nine months ago, Twitvid rebranded itself as Telly, as the company sought to help users find interesting videos based on things their friends were sharing. Since that rebranding, it’s launched a web app for video discovery, as well as apps for mobile users. Today, the startup is updating its iPhone app, adding a few features that it hopes will improve the user experience and make it easier for viewers to share. The biggest new feature of the app is the ability to group-share content.