Yelp caught in the chasm between boutique and scale is trying to use this competition to elevate their presence by sharing review content and listings with Amazon & Apple.
Apple while using Yelp review data has moved beyond Yelp listing data and has started to buy and build their own listings. They have also branched out to review data from other sources.
Facebook has demonstrated their ability to rapidly outpace Yelp with their own review platform. And thus has no need for Yelp.
Even in the context of Amazon, Yelp's position seems tenuous. Yelps future is dependent on developing a transaction marketplace.
Marketplaces are at Amazon's core and would be denied to Yelp in any Amazon context.
The problem with syndication is that the user's loyalty always belongs to the originating service and not the syndicator.
Where in the mobile local future of the four huge competitors does Yelp fit?