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The Ticker is the lightweight stream of friend activity that now sits in the upper right hand corner.
It's no longer allowed for an app to pop up and interrupt you.
Zuckerman talks about Open Graph, new social apps that are meant to help you discover what your friends are currently doing, beyond just the fact that they just Liked something. Facebook wants developers to do more than just use the Liked verb (and more than the Read, Watched, and Listened verbs too).