Like, it wasn't just an account they all posted on, they had to live together in the same house. This caused a lot of problems, as the interpersonal conflicts they sometimes had in public posts would be made worse by forced physical proximity, and you'd hear about arguments they had where they'd yell at each other over it. There was one time when it got really bad, and somone upset one of the Twilight Sparkles on this website so much, that it caused something called The Purple Incident, which was an event that no one knew the details of, but had major consequences for cohost and the real world.
It seemed like everyone on cohost was aware of all this, but it was almost entirely through rumors, and none of the webarks would talk about it publicly to confirm or deny anything, and it was unclear how the news got out at all