A few days ago I had a conversation about the business version of Facebook and the IBM Connections Cloud offering.
In the private sector, Facebook has nearly grown up to a global communication provider because the service is used by almost everyone. The success is not just based on good software but how money is made from the collected information. “Personalized advertising” is only one aspect of the business model.
What you get with Facebook Workplace is a modern software stack with basic social tools. Easy to use and end-user training might take small effort because it’s already well known.
But in general this kind of software is used to store important information, with Facebook as a system ultimately developed for data analysis. There must be a lot of trust given that your data will not used for the daily “big data” business.