Slack wasn't planned—it was born out of necessity. Stewart Butterfield's gaming company Glitch was failing, but the internal communication tool they built to coordinate their distributed team was exceptional. When they shut down the game, they pivoted to launch Slack. The MVP was already battle-tested internally, and the beta launch generated unprecedented demand.
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Apply Slack's lessons: use your product internally first, polish before launch, and let quality drive word-of-mouth growth.