I'm not so sure in this specific case. If I were a (cue pejorative stereotype for emphasis) scumbag ambulance chasing lawyer - I doubt there's anything in Facebook or Google's ad targeting demographics that'd give me quite the same opportunities as a rough-and-ready demographic of "people at or close to hospital emergency departments" to try selling to...

I hope (but am prepared to be shown otherwise) than neither Facebook nor Google have an easy way to target ads to people who've just posted "Faaark! Just been in a car accident! #YOLO #GladIBoughtAVolvo #ShouldntHaveBeenTexting"

(Evil-idea: I wonder if anyone's using siome combinations of accelerometer and GPS data to detect potentially traumatic events and selling that data on?)