Watching how Facebook manipulates users’ news feeds to maximize advertising revenue did bring to mind how much I appreciate Free Republic. You are never fed material here, it’s a rich buffet of all sorts of news sources and a wide variety of opinions about them.
I have to admit that getting positive responses to one’s comments here probably does engage some of the same dopamine receptors that Facebook’s “Like” button does. I might have on rare occasions spent more time on FR than I intended to...
Bingo - that red “New posts to you” at the top of the page can delight dopamine receptors. FR needs to be classified as a Class C drug (if this was the U.K.).