Username or EmailPassword
It needs to be pointed out that package management systems like aptitude, and "app stores" are not one in the same. They are not interchangeable. It seems people are constantly confusing two things that share some core functions as being the same thing. Linux users need to stop trying to take credit, directly or indirectly, for successful app stores such as that by Apple. And for that matter, they need to understand that software packaging, package management, and repositories didn't start with linux either.