If the staff of these companies was actually concerned about this issue, they wouldn't have allowed Obama to do this. It's clearly not an issue with the technique, but who is employing it.

> Have you been living under a rock? Cambridge Analytica?

Like I said, Obama did exactly that (from the article I posted):

> "Consciously or otherwise, the individual volunteer will be injecting all the information they store publicly on their Facebook page – home location, date of birth, interests and, crucially, network of friends – directly into the central Obama database."