Use deep links to bring your users into your apps from social posts or search.
Deep Linking from Google+ Posts
Deep linking allows the Google+ apps on mobile devices to direct clicks on a shared post that contains deep-link information to a resource within your apps.
If the user doesn’t have your app installed, they’re prompted to install it before accessing the resource.
G+ Post with Deep Link to Buy
Purchase page within app
Deep Linking from Google Search — App Indexing
Another way to bring users back to your apps is to apply for app indexing.
When a user searches for content available within your app, Google can show an "Open in App" button in in mobile search results. For instance, if a user searches for a restaurant and you’ve got that establishment in your dining app, a link can be shown to open the page within your app. Learn more about linking to in-app content.
