Most of my Facebook reading is on my iPhone, using the Facebook app, in spare moments now and then.
There are, of course, a bunch of quiz notifications in the info stream. They're supposed to take the form '[person] took the quiz "[quiz title]" and the result is [result].' (With various phrasing variations.)
But either a bunch of quizzes don't use the right display code, or the Facebook iPhone app has a bug, because roughly half of all quiz notifications say this instead:
'[person] took the quiz "" and the result is .'
Which on the one hand is annoying. But on the other hand is kind of entertaining, since I'm usually not especially interested in the quizzes or results anyway.