Originally Posted by snopes
But that's the point. If your hoax involves some obscure, specialized topic of no interest to the general public, and it's placed in such a way that even the small subset of people who might have an interest in the subject are unlikely to find it, that's not much of a hoax -- you can't distinguish between "nobody noticed this was a hoax" and "nobody even read this in the first place."
Just because there's no immediate outcry doesn't mean it's not been noticed and copied. I periodically search on a couple of my hoax items and find them quoted or referenced. Like a pebble thrown in a pool, the ripples get bigger and further away. For me, a good hoax is a slow-burning one. It can be extremely satisfying to see something apparently unnoticed for years before it's questioned.
I have to admit I almost got kicked out of an UL list for suggesting we invented a UL, planted it and observed to see how far it would spread (instead of simply gathering and discussing ones already out there) - I saw it as a social experiment!