This is interesting. Not only do they report that FB keeps reversing your choice, but they also say that even when it's on it doesn't work: things still keep coming in way out of order under algorithm control.

Further, even the guy who shows you how to do this doesn't recommend it, because there's too much material on FB to follow. Which brings up another problem that occurred to me the first time I saw an FB feed: it's too full of trivia. It doesn't have to be that way, but it is. LJ and DW tend towards fewer and more substantive posts, which are what I want to read.