I think you have to be a special kind of crazy not to consider that a problem.
I would argue that Facebook has less personal data than Google. Facebook has the data you might want public...Google has your worst secrets.
Cost of Admission > Fax Era (less connected)
The sad part is watching adtech kill more businesses as it devours its own tail.
Advertisement is an ok answer to the financial support problem of content. However, it has a serious flaw: It caters to masses rather well, and to niches very poorly. I like to think that a direct revenue flow (from readers to writers) would create strong incentives for more niche content. Investigative journalism, independent tech reviews; stuff that is desperately needed but not consumed by the masses.
Is is on us, techies. We can go down the ad-blocking arms race or we can go down the new business models race. One is destructive, the other is constructive.
Original content will always want to be free to make as much money as it can. NYTimes for example will publish a URL for sharing, but also have an Apple News exclusive URI that forces you in that app sandbox.
One thing I love about Facebook sharing is the commentary and comments below the content.