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I would love that as a quick and dirty service, e.g. Test haircuts, bio texts, job descriptions, etc against each other and ideally have a specific target group evaluate them.

Already exists for job descriptions! https://jobdescription.app

For all I know, it could exist for haircuts too.

Expensive! But they seem to target employers not employees who want to pamper their cv.

Aren't you worried choosing your look based on the demographics of mTurk would make you attractive to a non-representative sample of the population?

People have more in common than differences.

Attractiveness is very cultural.

According to the article, they'd make gp attractive to a highly educated sample of the population :)

You can use FaceApp for this now

The value of the parent strategy is that they got external feedback from many different people. Because it's hard to see oneself as a stranger.

Does Faceapp give a result of popularity? I don't think it allows testing different haircuts and see which one is more popular