Bestie is an "automatic camera" for the iphone which automatically filters and sorts your selfies by quality (or it's idea of quality, anyway).
There's nothing involved about the photo taking process. Just press the button and use the front facing and main cameras - optionally plus flash - to take as many selfie or group shots as you like.
When you're done the app claims to use "intelligent deep-learning algorithms" to discard bad shots.
An "emotions recogniser" tries to identify the pictures with the best reactions.
Your shots can be automatically optimised to make it look as good as possible. Or you can take control and apply a custom filter of your own.
And of course once you're done you can share the results online with a tap.
Bestie isn't the most essential of apps, but it might save you some time. And at least it's free.