Yes, it’s about Twitter faves/likes/hearts. And yes, website design choices do influence user behavior!
I found myself not bookmarking, as I would have done a day earlier, a horrifying image retweeted by journalists depicting men using phones to film a woman being stoned to death for adultery. I did not “like” let alone “love” the image but wanted to note it as important. We must have a system which allows for capturing the significant as well as the appealing.