Sure, but what businesses are so dumb that they will share their internal communications with another company?
Pretty much all of the ones that use that new-fangled telephone. Of course, back in the days when the telegraph was the thing, well, pretty much all of them used that too.
And the USPS does, in fact, have a pretty solid metadata look inside most businesses, since they know the destination of pretty much every package and letter sent or received in the USA.
Note that teleconferencing sans Facebook still means the entire datastream is going over wires owned by, well, another business, who can look, or not, at their discretion.....
In other words, the only thing new here is the Facebook logo....