The first thing I do now on each Facebook open-source reveal, 
is to check the PATENTS file for the toxic second paragraph, 
to see if they've changed it.
Sadly, no. I can't imagine being able to use this at any decent-sized company with lawyers. :-( 
https://github.com/facebook/react-native/blob/master/PATENTS 
See for example the discussions at https://news.ycombinator.com/item?id=9111849 
(eg. https://news.ycombinator.com/item?id=9113515)