Re: It is rather odd though,
"On the face of it it, the observation that fake goes farther than non-fake says that the twats, at least in the aggregate, can and do know the difference, and treat the one differently than the other."
Naa, it's more likely that people will not only retweet something that reinforces their own prejudices, but that the fake stuff is more exciting than the real world, usually stuff they can vent their faux outrage at.
I doubt they stop and think long enough (or at all!) about whether it might not be true.