RankPic (https://www.rankpic.info) is an app to help users crowdsource their best photo. I've been building over the past 3 years. It's grown into a lovely community of people who help each other pick their best pictures for dating apps, professional photos etc.

I've seen some pretty fun novel use cases, such as (multiple!) people using it to pick out glasses, wedding invites & so on -- https://apps.apple.com/us/app/rankpic-photo-ranking/id160299... (ios) -- https://play.google.com/store/apps/details?id=app.rankpic.ra... (android)

Great idea, validate before getting validation on social media. nice.