Nearly without exception, every anti-Trump post that gets popular is posted between 8 AM and 6 PM Eastern.
99% of those are posted in the 8 AM hour.
Of those posted within the 8 AM hour, roughly 75% of them are posted within the same 15 minute block.
One or two additional anti-Trump posts are posted and gain popularity between 9 and 1 PM.
Pro-Mueller posts seem to be posted generally between 9 AM and 1 PM.
Pro-Trump comments posted outside of the 8-6 time-frame get some kind of discussion. If posted within that time-frame are viciously attacked.
Anti-Trump comments posted outside of the 8-6 time-frame are largely ignored but are not attacked. If posted within that time-frame, they are echo-chambered to the top of any discussion.
Out of curiosity, I watched Voat to see if this held true. It (edit: generally) does, but only in Anon subs.
I thought perhaps this is because people are at work during those times and trying to avoid their jobs but that doesn't explain why content doesn't follow the same rules on the weekend.
I thought perhaps this is because everyone of consequence in the matter is working and so the content is generated, filtered, etc. but that doesn't explain why it stops at 6 instead of 7 or 8 (west coast being 3 hours behind).
Following occam's razor, the least amount of assumptions would seem to indicate that this is a coordinated effort.
The social media sweet spot is usually between 7-8 AM EST, that's when most people are looking at their internet before work or getting into their jobs that they slack off in first thing (gotta have your coffee).
Marketing professionals use programs like hootesuite to autopost content at predetermined times.