I recently saw an FB "data engineer" talking about "experiment review sessions", where the - presumably engagement related - results of interface changes are di

I recently saw an FB "data engineer" talking about "experiment review sessions", where the - presumably engagement related - results of interface changes are discussed (he also expressed hope that all companies work that way). It's very rational. The user needs a good user interface, the best that can be built. What is the best? The one the user likes to use, day in day out. Is that a problem? Obviously not for the platform. When FB CEO announced that he want's to make users happy, he acknowledged his real intents: mass, aggregate control of behavior. I cannot deny that it carries a purely instrumental view of humans - but that's again only rational in the context of business.