It's not the first time I hear it, but what is it supposed to mean? Is there a single thing that can be called "linux userland"? Also, I doubt that someone combines Linux kernel with Windows XP userland. So in some regard all userland tooling running on the linux kernel might be considered "linux userland".
If I understand the term userland correctly it is a term from kernel developers to say "this is code that doesn't run in the kernel", so it might not be helpful to any popularity discussion at all.
