Instagram unveils live-streaming feature and Snapchat-style disappearing message function

Instagram is muscling in on the live-streaming trend and taking on rival Snapchat  by updating its app with a familiar looking disappearing private messaging function.
The image and video-sharing platform has made several key changes to its core product in a bid to keep pace with competitors like Snapchat and Facebook, the first of which will allow users to broadcast live within its ephemeral content service, Instagram Stories. 
Live video within Stories is being rolled out f