It wasn’t long after the launch of Slack’s namesake team-communication software last year that the San Francisco company was catapulted into the “unicorn” club — that growing group of startups with valuations above $1 billion.

More than a few eyebrows were raised when the company achieved a $1.1 billion valuation last October, but this week, the company went much, much further. A new funding round has brought Slack another $160 million beyond the $180 million it had raised already, and its valuation is now $2.8 billion.

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