Presentation on how agile was implemented and the banana problem

I had come across a video presentation on HN a while back (2 or 3 months ago). It was about how Agile/Scrum was implemented at a certain company (reddit or linkedin or some other company like that). As part of that presentation the presenter talked about 3 major things: 1. How stories got prioritized among the different product owners. 2. The banana problem - when to stop refactoring 3. the packing problem - how much to include in a release.

I am unable to find this presentation. Done all sorts of searches for banana problem and refactoring, etc and havent managed to come up with anything. Can someone help me?