Here’s how to share an interesting iPhone app you’ve found with your friends.
Latest iOS versions integrate a share app option that you can use to send a friend an App Store link from where he/her can download the respective app.
So, if you’ve found an interesting app that you want to let your friends know about, here’s what you need to do.

When tapping de post you shared, your friend will open the app’s page on the App Store, from where he/she can download it.
Fast and easy, right? 😀