Getty ImagesMega-corporations — from Facebook to Amazon — are creating modern-day company towns. In Menlo Park, California, Facebook plans to build a new campus with 1,500 residences, a walkable retail district, a grocery store, and a hotel for its employees. Meanwhile, Amazon recently announced that it will build a second headquarters that could effectively turn the chosen city into a company town — much like what happened to Seattle when the online retail giant came to Seattle in the late 1990s.