Specifically, Mark has allowed Facebooks mission to change from "giving people the power to build community and bring the world closer together" to "optimize ad revenue from a pre-existing group of users", and is now doing the same to Instagram. Look at the changes made to Facebook in the last five years and tell me, with a straight face, that they were all made with the original mission statement in mind.

A Visionary CEO would chase the mission and expect revenue to follow.