more than 40 million Americans work outside an office. "We believe our country, our society, our economy is on the cusp of a once in a century shift in how, where, and why we work," co-working is more than just a post-recession fad among freelancers. A growing number of corporations are experimenting with workplace mobility. The global consulting firm Accenture lets employees use an app called LiquidSpace to book co-working sites.