I work at a largish company (~2K employees, many of whom have been here for 20+ years). We have lots of information silos, and vast amounts of tribal knowledge

I work at a largish company (~2K employees, many of whom have been here for 20+ years). We have lots of information silos, and vast amounts of tribal knowledge exit the door with retirees every year. Recently we learned that StackOverflow offers their engine for private companies. "StackOverflow for Teams" allows you to set up your own internal Stack Exchange with all the benefits and conveniences that come with that tool. We are just now getting buy-in from IT and Senior Management, and we plan to start rolling it out across the company within the month. It's not cheap, but we calculate that it will pay for itself if it saves every employee an hour or two per year. I'm confident it will do much better than that.