Is it just me, or are most of the results in that paper rather obvious and not very useful in general, outside of social media posts. In Facebook posts, it's not surprising that men talk more about computer games and sport, and swear more. Women using more emotion words and men more object words, is again fairly obvious.

If one took an academic text, a short story, a novel, a blog post, or some other more careful piece of writing, it is unclear whether this kind of classifier would work as well.

It seems like the differences in word choice are strongly driven by the topics people choose to talk about on Facebook. Besides obvious cases like "shopping" vs. "xbox" there's also more subtle things like

> we noticed ‘my wife’ and ‘my girlfriend’ emerged as strongly correlated in the male results, while simply ‘husband’ and ‘boyfriend’ were most predictive for females. Investigating the frequency data revealed that males did in fact precede such references to their opposite-sex partner with ‘my’ significantly more often than females. On the other hand, females were more likely to precede ‘husband’ or ‘boyfriend’ with ‘her’ or ‘amazing’ and a greater variety of words, which is why ‘my husband’ was not more predictive than ‘husband’ alone. Furthermore, this suggests the male preference for the possessive ‘my’ is at least partially due to a lack of talking about others' partners.

To disentangle the effect of topic choice from word choice, you'd probably need a controlled study with fixed writing prompts.