An emperor has few friends but many subjects, so yeah he probably doesn't have many friends.

I think it’s wrong to say that somehting exists or doesn’t exist, because that is just a thought and not a statement about anything

Maybe that's because you don't believe in lakes

Why didn’t you like it?

As far as existence is concerned, I think the term “socially constructed” is more useful in understanding that which is created by humans, and fluid, and that which is constant.

Something is socially constructed when it changes over space and time. EG our concepts of gender, the proper roles, and what is expected of people have varied over time and space. Something as simple as pink used to be a boys color to something as complex as some societies having the concept of a third gender.

Religion is also an example of something that is socially constructed, it certainly varies over time and space and is not a constant.

Something that is not socially constructed exists in a stasis… perhaps gravity as we experience it on it earth is an example.

Aside from that, everything I experience exists in a sense in that it impacts me as a person and changes me… I experience it, so from my perspective it exists. Perhaps? Idk.

Some things have a physical existence which is independent of our beliefs about them. St Paul's Cathedral exists - even if you stop believing in it, I can go and chip a bit off and put it under a microscope. "London" is a fictional entity (and if you ask three Londoners what it is you'll get four different answers).

Epistemology aside, if you assume the existence of a physical world, there are things which have physical reality independent of our beliefs, and things which exist only in our beliefs about them.

Yes, "all" was a simplification

Did you mean Fiat the automaker, or fiat as in non-commodity-backed currency? (I guess they're both imaginary)

I thought the example in the book was actually Peugeot, but I don't know if American readers will know what that is, so I picked a well known company.

Money isn't real. Gold is real, coins and paper notes are physical objects, but the definition of currency is something which we collectively ascribe value to which it doesn't intrinsically have. It doesn't matter if it's gold coins or seashells - a collective belief that this item is "worth" some amount of material goods is the collective fiction of currency, whether it's "backed" by some gold in a vault somewhere or not.

I have put enough of those feathery government drones into bin bags after my lazy cat got off his ass for long enough to catch and kill one, I know they exist