Twitter used to be a sort of surrogate newsroom/barroom where you could organize around ideas with people whose opinions you wanted to assess. Maybe you wouldn't agree with everybody, but that was part of the fun. But at some point Twitter narratives started to look the same. The crowd became predictable, and not in a good way. Too much of Twitter was cruel and petty and fake. Everything we know from experience about social publishing platforms—about any publishing platforms—is that they change. And it can be hard to track the interplay between design changes and behavioral ones. In other words, did Twitter change Twitter, or did we?