Would Anybody like the Critiques Back?
RayPA used to start up critiques most weeks, sometimes more often.
Basic rules were one photo from each participant, and limit of five people.
Everybody commented on the other four photos. People who were not part of the thread were asked not say anything at all.
It worked very well, in my opinion.
As a feature which highlights images it could easily be revived if somebody has the energy to do it, and if others contribute.