It might be useful if you get bored and want to know what people are talking about. You may have followed someone because you liked how they contributed to discussion. In that case, looking for what they've commented on is as relevant as what they share/post. Or, maybe you're bored and used up your feed, or are bored of your feed. Looking at comments would stimulate you differently, if you were interested. If you see a comment you'd like to know the context to, there's a link to the post right there. Some people could consider chatter to be a superior feed: in your normal feed, those were posts users were interested in enough to share; in chatter they were interested enough to say something about it.

Very interesting article. Thank you for sharing!

It's been a few years since I had U.S. History, but I think it was a combination of America having a drinking problem since colonial times, religious pressure, and a women's movement against abusive, alcoholic husbands. People in America thought there were too many drunk, non-productive members of society and decided to do something about it. And they didn't sit about arguing over it. Many went right into bars to encourage temperance. One memorable temperance movement figure, Carrie Nation, went into saloons and destroyed liquor bottles with her hatchet. What a way to spread the message, right?