Basically, it's about a reversible procedure called "calli" that turns off the neurological response to symmetry, smoothness, and "aesthetic" of a human face. So someone with the procedure can recognize different faces, but they don't feel any better about a pretty face than an ugly one.
The story follows a girl who had calli done as a young child, and then decided to go to college with it turned off. When she's there, there's a push on campus to mandate the procedure, to combat "lookism." The story is written like a documentary film, so it has little snippets of interviews, news articles, etc. about the debate.
The range of emotions we get from looking at other people's faces is intrinsically worth saving. But, people get a huge advantage from being good-looking. It's effectively discrimination to consider people who are good looking more trustworthy, nicer, etc, yet all of us do -- it's hard wired. The world is not really fair to someone with a bad looking face.
These apps aren't calli but they do mediate how we see the world, ourselves, and others to a huge degree. I don't envy any middle school girl who has to navigate this landscape. Anyway, I highly recommend the story, it was such an interesting way of looking at the issue.