Twitter has launched a new service that lets iPhone users take videos and post them on their social network. The app is activated with your Twitter log in and home page soon shows videos from friends. In profile, a people icon lets you search for contacts from the phonebook. Using explore we can search popular hashtags. The video icon on top lets the user capture a six- second video by pressing the screen. You have the choice of muting the audio before you Tweet, or should we say Vine, the video.