Search pros, let's discuss this. This Business Insider piece is about the situation and the big players in 'latent search" (ie conversational search):
Google, Apple, Facebook And 'Latent' Search - Business Insider
A good read. I was surprised by the term "latent search" to refer to "conversational search," but then I realized "latent" came from LSI -- latent semantic indexing.
Surprisingly, the author suggests or implies that other Google's switch to semantic search in Hummingbird is merely a reaction to Facebook's Graph Search and other advanced trends in search. There is also a fairly stupid quote from Larry Kim at Wordstream (who however seems great at "newsjacking"), used apparently to support this argument.
That's sheer nonsense, in my view, and unfair to Google, which is far and away the leader and trend-setter in the area of semantic search, and search innovation in general.