Hi friends, according to my experience, the effect of Facebook ads is not very good nowadays. I recommend you [b]buy keyword installs[/b] to boost your app ranking and then make more people see your app in the app store. Or you can do both of them, and see which effect is better and then do one of it.
Of course you should get keyword installs which can boost app ranking in hours. A survey shows that over 65% users discover new apps by browsing or searching on the app stores, and most of them just browsing the top10 apps.