I'm seeing a lot of responses about the morality or PR implications of trying to A/B test this, but this seems fundamentally impossible to A/B test to me and points at a bigger problem with what companies and their marketing departments believe they can know and the limits of what science can actually do.
The hypothesis here is that usage of professional but automated editing tools to make people look more beautiful than they really are promotes unrealistic competition standards and makes people feel worse about how they look in a regular mirror that is showing them the truth.
How do you A/B test this? Giving the feature to some people and not others isn't good enough. The impact is because of seeing other people look more beautiful on the Internet than they actually look in person. How are you going to prevent a user from seeing the photos of other users who use filters? Even if the global social graph had strict partitions, which I imagine isn't the case, these photos leak into web search, news articles, and the same technology gets adopted by other platforms. You can't A/B test something that impacts the entire broad culture. The world is too connected.