Not really a bug, more something that should be prevented.
There's this guy who goes into a crowded room and proceeds to show really gross pictures on everyone's screen. He says some website that's incomprehensible while the images are flashing and it takes a pretty long time before it disappears.
I tried turning on the personal space, but this didn't help.
The issue is not that the gross pictures are there, anyone could make that. But the issue is that it can't be disabled by blocking the user, because there's no way to see anything in the menu screen. Even if we could see the menu screen, there's also no way of knowing who is spawning the pictures.
I know it's a free game, but even so, this really should be stopped in some way.