I'm not sure I follow you here. When a friend shares an article, for example, the article comes as the owner put it on the web- page, author, etc. When I share that article, I say something like "h/t to kbutler for the find" That give credit in my circle to the person in my circle who found it. It's just a courtesy.
> When I see something that my friend has found on facebook and I share it, I always acknowledge them for finding it.
That's suggesting Intel should say, "We're using Minix in our chips - h/t Joe Random who posted about it on Facebook"
The courtesy they owe is to Andrew S. Tanenbaum, the /creator/ of the work they are using, not to some individual who happened to blog about it.
You have a legal and ethical responsibility to the creator of the work, not to whomever put it in your feed.
Of course, we should credit our grade school teachers each time we do arithmetic - Thanks, Mrs. Ashliman!