There are several ways you can export and build mobile apps from Construct 3. This tutorial outlines the various options, and links to other tutorials to explai...
TWO QUESTIONS: IS THERE A WAY TO USE GOOGLE ADSENSE/INTEGRATE?
ALSO, HOW CAN I INTEGRATE FACEBOOK USERS PROFILES FOR LEADERBOARDS FOR COMPETITIVE PLAY, IS THERE A FACEBOOK API FOR THIS?
Yes there is.
Insert new object > scroll to monetisation > select MobileAdverts, it uses Google Adsense. For the Facebook API I believe you should just be able to insert the 'Facebook' object.