Product From 0 to $1B - Slack's Founder Shares Their Epic Launch Strategy “HELL YEAH WE'RE USING @SlackHQ AT WORK I. LOVE. SLACK.” “HELL YEAH WE'RE USING @SlackHQ AT WORK I. LOVE. SLACK.” “Dear @SlackHQ, I love you. Yours, Dan” “@SlackHQ YOU COMPLETE ME” You’ve probably heard about Slack’s exponential growth. And you may have read how the internal-communication platform — now just two years old —