After two years of private beta testing, Facebook is unleashing its Work software on the world. The product is very similar to the social network used by over a billion people every day. But it focuses on connecting users with a network their colleagues at work, and charges a fee per user.
Work will be taking on office communication companies like Slack, a Silicon Valley darling which has obtained a multi-billion-dollar valuation, aka "unicorn" status, based on its aggressive growth. Right now it appears Facebook is undercutting Slack, charging between $1–3 per user, versus the $6.67 per user Slack charges for its standard package.