When to use: When you want to get people to install your mobile app.
Tip: Register your app with Facebook so you can set a cost per action (CPA) bid. You’ll only pay when people install your app from a Facebook Ad.
When to use: Get more activity on your mobile app.
Tip: Create a Custom Audience of people who use your mobile app, then reach them with an ad encouraging them to take specific actions.
Design Guidelines Facebook Image Size App Installs, App Engagement
Recommended image size: 1200 x 628 pixels
Text: 90 characters
Your star rating from the App Store or Google Play store will automatically show on your ad.