As far as I know, the closest thing to that on this forum are the threads-gallery of images taken with Fairphones:
- FP2 gallery: FP2 - Pictures Gallery
- FP3 gallery: FP3 - Pictures Gallery
- FP4 gallery: FP4 - Pictures Gallery
- FP5 gallery: FP5 - Pictures Gallery
On the other hand, I have found a small Flickr community on Fairphone photography, but I don’t know if it is active:
Good luck!