Adam Mosseri - Data Informed, Not Data Driven
www.youtube.com/watch?v=bKZiXAFeBeY
Video
UX Week 2010 | Adam Mosseri | Data Informed, Not Data Driven
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
At Facebook, analytics play a critical role in informing design decisions, but internally there's a wariness of the idea of design by numbers.