Anyone Using Facebook Campaign To Promote Apps?

Hi!

I’m new to apps building and marketing.  People have been using iTunes and google play to upload their apps there.  However, nowadays they are both full of millions of apps which people cannot notice your apps at all!  Sad story!  Just wonder if anyone have build private apps and did not use both of these platforms.  Instead of joining the rest, run a Facebook campaign, create a link there for people to download so as to create awareness of your own apps.  Of course you have to pay.  However, the audience is more targeted there.  Please give me your view.  Thanks!