>Okay, so in the matrix, it looks like a big MMO with other bits floating in the sky that you can travel to if you want to see that private system/island right? Each & every personal network its its own island. So like a building that sell furniture & has a decent matrix presence is a big floating chair with avatars of people who work there or are just checking out their catalog walking around on it right?
No. Personal networks mostly no longer exist in 5e. Its weird and dumb, but its all hosts now, which are more like their own "instances" of the matrix cut off from the rest for the most part.
>What does a silent icon look like?
Nothing. A spotted icon looks like the regular icon but maybe with an overlay based on your tastes. Maybe a metal gear style ! above their head, or a target lock, or just them being slightly hazy.
>Every time you do shit you have to put "marks" on the icon you use & it creates a link between you PAN & the icon which GOD & demiGODS can use to "backtrace" you personally & fuck you up?
Yes, you need to use marks, no, marks can't be traced back to you and erase themselves when you log off if they are illegal marks. Also GODs and DemiGods are mostly glorified script kiddies hitting the "OS orbital ion canon" button when someone's OS gets too high. Your marks MIGHT be noticed by spiders, but they don't trail back to your deck.
>What all constitutes an icon? Is everything your avatar "sees" an icon? Beyond set pieces i mean.
Any persona, device, file, and the enterances to hosts are icons.
>Can you say, disguise am important icon as a puplic fountain in the matrix & just hope no one interacts with it because it is camouflaged?
Unfortunately you can't pay homage to Psychopass in this way, as AR icons of real world things don't physically mask vision. You could change an AR billboard, or make a fake AR wall, but its trivial to see through. AR is not a full blown reality filter.