They did nothing to demonstrate non-Facebook logins are actually pseudonymous. I use my real name without using Facebook. I believe many do as well. Even if not true it could be true and they haven't shown otherwise.
They presumed the effect they are trying to measure. It is easy to draw a conclusion when you start with it as a premise!
I think it's more useful to think of pseudonyms as a superset of read identities--they're names that do not have to be your real name, but they do not have to not be your name either.
Since most sites would not proscribe using your real name as a username, this definition makes the most sense.
Comments
They did nothing to demonstrate non-Facebook logins are actually pseudonymous. I use my real name without using Facebook. I believe many do as well. Even if not true it could be true and they haven't shown otherwise.
They presumed the effect they are trying to measure. It is easy to draw a conclusion when you start with it as a premise!
I think it's more useful to think of pseudonyms as a superset of read identities--they're names that do not have to be your real name, but they do not have to not be your name either.
Since most sites would not proscribe using your real name as a username, this definition makes the most sense.