When we unite against a common enemy that attacks our ethos, it nurtures group solidarity. Trolls are sensational, yes, but we keep everyone honest. | Game Memorial
I had that installed as a mod in my forum but i removed it later. When the posts are next to each other or close[1] then its fine to hide the second signature. But when a member makes the first post and then you get 5-8 replies from other members before the first member reposts then the signature should be visible. Signature helps new members start rembering other members.
But true enough, if I know someone by their sign mostly (because they have a specific image and their avatar is too generic or non-existent), I'll tend to recognize them in the conversation by signature -- plus it doesn't require moving your eyes along the horizontal axis. So I guess I'll never install this on a forum of mine. No harm done either way :)