I can see one major bias (albeit inferred) - they consider anyone posting using Facebook to be using a "real name" - and assuming that anyone posting using a "real-like" name outside of Facebook is a pseudonym.
If this is true, they're really only measuring and comparing the quality and quantity of Facebook-identified commenters vs other commenters.
Only Facebook commenters have "enforced" real names, in that their Facebook name is used. Signing in with a Disqus account or Twitter uses the names that a user chose on that service, which typically is not a real name but some sort of pseudonym.
So while it's true that it's basiaclly comparing Facebook-identified commenters to other commenters, only Facebook-identified commenters are required (assuming they sign in with their actual account) to have a real name.
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I too think this page is too light on details.
I can see one major bias (albeit inferred) - they consider anyone posting using Facebook to be using a "real name" - and assuming that anyone posting using a "real-like" name outside of Facebook is a pseudonym.
If this is true, they're really only measuring and comparing the quality and quantity of Facebook-identified commenters vs other commenters.
Only Facebook commenters have "enforced" real names, in that their Facebook name is used. Signing in with a Disqus account or Twitter uses the names that a user chose on that service, which typically is not a real name but some sort of pseudonym.
So while it's true that it's basiaclly comparing Facebook-identified commenters to other commenters, only Facebook-identified commenters are required (assuming they sign in with their actual account) to have a real name.