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Most people don’t know that Slack actually came from a failed video game project. In the early 2010s, Stewart Butterfield and his team were building an online multiplayer game called Glitch. But as they worked on the game, they built an internal messaging system to help the team communicate more effectively. The game failed. It shut down in 2012 after years of development. Now, Slack is a multibillion-dollar company used by millions of teams around the world.