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Re:A Reboot of the Legendary Physics Site ArXiv Could Shape ... by arcanus on Thursday May 12, 2016 @09:15AM (#11683113)
I think email (private communication) will always be useful.

However, some general questions being publicly available would be also arguably have utility.

Re:A Reboot of the Legendary Physics Site ArXiv Could Shape ... by curt15 on Thursday May 12, 2016 @03:12PM (#11685955)
There are already established forums for discussions, like mathoverflow.