Last month, former Facebook and Pinterest executive Tim Kendall told Congress during a House hearing on the dangers of social media that Facebook made its products so addictive because its ad-driven business model relies on people paying attention to its product longer every day. He said much the same in the Netflix documentary “The Social Dilemma,” in which Kendall — along with numerous other prominent early employees of big tech companies — warns of the threat that Facebook and others pose to modern society. Kendall — who today runs Moment, an app that helps users monitor device habits and reinforces positive screen-time behavior — isn’t done campaigning against his former employer yet.