I notice that there is a group of users on this site who like to leave unconstructive comments on each other's posts. For example, A writes "Great answer, +1" on B's posts and B writes "Short and sweet, +1" on A's posts. Often there are a few of these comments each day, accompanied by the upvotes on each other's posts, which I notice upon further investigation.
What should the community, mods or SE staff do about this? These users have learnt to upvote only a certain number of posts of his friend each day so as not to trigger the automatic script for removing serial upvotes. Can the mods tell these users to stop writing these silly comments? Also, can the mods invalidate all their upvotes on each other's posts if they exceed a certain number a week or a month?
I am aware that mods can view long term patterns, and I would like some kind of policy to be set on removing this kind of tactical serial upvotes. I will not name these users here, but I know exactly who they are.