I've experienced this too, and think it's delightful!! I second your tumblr theory and have seen a lot of pro-commenting posts going around, but also wonder (though it pains me to say it) if it has something to do with wattpad? I can't make heads or tails of wattpad as a platform but listened to a podcast that explained it, and heard that they have a function that allows commenters to leave comments on individual lines/paragraphs, and they see more comments there because of it. So maybe it's people getting into more of a commenting habit there? In addition to all the posts circulating on tumblr?
no subject
Date: 2016-01-23 11:44 pm (UTC)