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.
Being more inclined to pɹÉÊoÉ snoɯÊuouÉ's point of view (how stupid the average person is, etc.), I wonder if they analyzed if there is a distinct subset of twats who are responsible for most of the fake re-tweets.