I haven't figured out the reason for the out-of-whack disparity yet. Is it because Zuckerberg lacks charisma, because he has Aspergers and people hate the awkwardness, or because FB is the tallest poppy, or because journalists have found a credentialed home on Twitter (blue check mark)?
This.
Twitter made a deliberate decision to recruit opinion-formers early on.
The face of Faceache is Zuck, with his blank expression and absurd haircut (surely after 20 years, he could find a decent stylist). The face of Twaddle (in the UK) seems to be Stephen Fry - a comic that I used to admire. Now, not so much.
I think Twaddle did a better PR job than Faceache from the beginning. I think they're still doing a better job.
/me never used either service