Data from a 2008 Bersin & Associates study of more than 800 HR and learning professionals supports the need for informal learning strategies in today's challenging business climate. The study reports that 80 percent of all corporate learning takes place through on-the-job interactions with peers, experts, and managers. But even more important are the expectations of Millennials (those employees younger than 25) in the workforce, nearly all of whom expect to find on-the-job learning portals, such as Facebook or YouTube, as part of their work environment.