Facebook allows Google to crawl and index its mobile app
blogs.wsj.com
blogs.wsj.com
I see this as facebook leveraging mobile search more than google leveraging facebook to keep search relevant. But I guess that is a matter of perspective.
I see this more along the lines of Google continuing their objective of getting us the information we want when we want it. Mitigating threats to competitors is just really a benefit of them continuing their innovation with search.
[0] http://searchengineland.com/google-brings-app-indexing-suppo...
This, on the other hand, is Google sending you directly to a yelp://-or-somesuch URL.
Basically, Google is taking charge of doing the client-negotiation step, so (if this catches on) sites don't have to worry about doing that redirect themselves any more.
For example, if you have Twitter for iOS installed on iOS 9 and you click on a link to https://twitter.com in a Google search result, you switch into the app's main screen immediately.
[0]: https://developer.apple.com/library/prerelease/ios/documenta...
I fail to see the difference between this and deep linking within the app.