Are you implying that one should not be offended by that? It's commonly mocked when it becomes apparent.

The benefit and promise of social media, at least early on, was that it was supposed to be authentic - that when someone posted, it was really coming from them. Engagement was truly personal, at least for a little while. It still is for most.

In the book-publishing context, ghost writers have to be credited, even if the attribution is in small print.