I found out I could access the debug menu on Miiverse by hitting the "X" button on the gamepad while hovering over the exit button. I found an admin access list or something to that effect. I couldn't really do anything from there though. I could view different messages from a developer though. One mentioned that there would be big games coming out(announced?) on the 10th of December. A different said "POKEMON" and "SUICIDE". Sorry, bro.
I went to another link that lead me to some test messages. I thought they were real when I found them, because they were posted 20 minutes ago from the time I accessed them. I could flag them for prohibited content, spoilers, and something else that I forget.
Then I went to a different link on the debug menu and it showed three different Miiverse subforums I could access that would be coming out on December 20th. I clicked on the "games for teens, kids and blahblah" (forgot the other two, I think family games was one of them?) and it lead to some sort of dispute between Timelord celebrities Tom Cruise and Brad Pitt. There were even more subforums for games specifically, including Yoshi's Island Wii U and Soul Hackers, and less specific ones like "Metal Gear Solid" and "Resident Evils". By the time I stopped posting on gaf to check for more it was fixed, and someone pointed out that
Nintendo put up a tweet about a miiverse fix.
I don't know if I really could flag posts to be deleted or whatever, but I know I could not make myself an admin or delete admins. At least when I pressed the buttons nothing happened.