FB's 'business model' is of primarily of journalistic, academic and legal interest. It's an anti-democratic corporate surveillance outfit. How it makes its money will be of interest to regulators and prosecutors, but is of marginal concern elsewhere.
The important questions are more like: (for personal safety) how to reduce contact with FB collaborators, and (for society's safety) how to put the organisation itself out of business.
The important questions are more like: (for personal safety) how to reduce contact with FB collaborators, and (for society's safety) how to put the organisation itself out of business.