How facebook measure app installs - Android IOS

Question

Facebook ads has a feature that it can knows how many apps are installed from advertising in facebook https://developers.facebook.com/docs/ads-for-apps/mobile-app-ads#advanced

I know google provide referrer/campaign feature to detect which campaigns, websites, and other apps are referring users to Google Play Store to download my app https://developers.google.com/analytics/devguides/collection/android/v4/campaigns#overview . But when I see facebook sdk(android) source code, it doesn't use google campaign mesurement, so which technique it use to measure app installs? And can My app knows if it is installed from advertising in facebook or not(with google campaign, my app can catch the intent after installing and get referrer information to know utm_source)