I also agree with your idea. Social media is turned out to be the best platform to promote anything and for an app, I can only say that it will provide you immense success for the launch of your app.
Recently you can do ASO(App Store Optimization) to promote your application successfully. Social media is also beneficial to get proper traffic and visits towards your app.
There are many things which we have to do for promoting an application.
1. Make facebook page of your app.
2.App must have a Twitter handle.
3.App reviews(by submitting your app for reviews on many sites)
4.App directory.
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