Private messages as ongoing conversation threads, instead of a post & replies.
It would be good to have the private messages work more like ongoing IM conversations, rather than like emails with an original message and a chain of replies.
It would make the sidebar much tidier, as the same person or group would not appear multiple times.
Thanks for the feedback! We are currently working ways to improve our private messaging experience. Making one feed of conversations with a user is a project we plan to work on.