> there is nothing wrong with a social media service optimizing for that preference
I think there is. The world has already reached a point where we live in information bubble, surrounded by things we want to see and that agree with us. People are depressed and feel inadequate.
Formerly reputable news sources have realized that people don't want to be informed, they want to be outraged, or feel smug and correct, or see pictures of cats, and so real news is relegated to a lesser status.
I would much rather websites present me with the truth, even if I don't like it as much, than live my life seeing only attractive people and reading only good news, but ending up woefully depressed and un-informed, with feelings of inadequacy and no understanding of what in the world is broken.
I think news agencies have a responsibility to society to present news accurately, even if people find the news less pleasent to read than pictures of cats.
Similarly, I think social media companies have a duty to present a semi-accurate view of society where possible.
I would rather have a realistic view of what people look like than have a series of recommendation algorithms and feedback loops result in me seeing only "conventionally attractive" people.
Of course, we've kinda already screwed ourselves here with hollywood/tv/movies. Perhaps it's too late to step back.