Worth pointing out: The author of this article works at Kayak, which has an iOS app of 176MB.
https://itunes.apple.com/us/app/kayak-flights-hotels-cars/id...
(As far as I can tell, the answer to "why is LinkedIn.app so large?" is not "because LinkedIn's iOS team sucks", but "because LinkedIn's iOS team works under a number of constraints, including app size, and app size is not a particularly powerful constraint to optimize for.")