This document discusses the changing nature of leadership in today's business environment. It outlines 5 major developments driving this change: 1) rapid technological innovation and adoption, 2) shorter lifespans of companies, 3) more informal vs formal organizations, 4) increased social media and connectivity, and 5) greater transparency. The document then presents four models of leadership that have evolved from a traditional top-down, formal approach to a more distributed, authentic, and connected approach where leaders facilitate goal-setting and empower followers through social media connections.