I have decide to promote my app via advertisements. I want buy ad on Facebook for couple of days.
Anyone have experience with this type of promotion. Is it worth it or is it just waste of time and money.
And what is best way to promote “legally” android app for boost downloads and review and start making some real money ?
Thanks for your advices and have a nice day 
It was usually expensive, not worth for indie.
As for best way to promote legally, I also wanted to know.
According to a 2016 report by Kenshoo, mobile app ad click-through rates (CTRs) went up 32% YoY, while the inverse happened to CPC (cost per click), which decreased by 33%. Because of Facebook broad audiences, Facebook ads is an effective promotion way, so you can have a try.
Effective ways to boost app downloads
Create an Enticing App Icon
Your app icon is the first thing someone sees in the app store, so the design you choose is critical to your success. Make sure you use a design that serves as a clear representation of your app. It should provide as much of a clue as possible to what users will find after they install it.
Get positive reviews
The more positive reviews an app has, the higher its rating will be. When users rank an app highly, it will also be ranked highly, which naturally improves downloads. You can incentivize users to leave positive reviews on your app, or get from review-providers, like reviewapp4u, it is economical and effective.
Select right keywords
Basic requirements for optimal keywords are – relate to the app; bring high traffic; reduce competition.
Name and Describe Your App Appropriately
Apps with popular keywords in their title and description may see more downloads. Do your best to choose a name that reflects what your app Users should not scroll past your app when looking for something to fit their needs.
List outstanding features into app description and explain the main purpose of your app. Besides, adding your keywords as more as possible to the first three lines of the description will attract more users.
Using Eye-Catching Photos and Videos
Photos related to your app that highlight your most popular and needed features will immediately encourage downloads.
Analyze your User
It’s not all about the number of downloads you get. It’s also important to know how, when, where, and by whom your app is used. Analytics are very important to determining what your users want the most out of your app, and how you can deliver that. They’re also the key to generating continuous downloads
There are a lot of tools out there for analytics for your app.Such as Amplitud,Apsalar,Localytics,Appsee,etc.
Market Your App Effectively
Once an app has been launched, the next step is to promote.Here are some app promotion methods for you, details as follows:
[ul]
[li]Social media[/li][li]Sites like Reddit and Digg[/li][li]Email Marketing[/li][li]SMS marketing[/li][li]Content Marketing[/li][li]App directory sites[/li][li]Relevant blogs/magazines[/li][li]Cross promotion[/li][li]CPI advertising[/li][li]Make a video[/li][li]Offline promotion[/li][li]Press Release[/li][/ul]
How to get more app reviews
[ul]
[li]Build a high-quality app[/li][li]Kindly ask your users for app reviews[/li][li]Incentivize Users to Review Your App[/li][li]Use an App Review Plugin[/li][li]Time App Review Pop-ups after Certain Conditions are Met[/li][li]Leverage the reach and power of social media[/li][li]Run a Contest[/li][li]Ask and You Shall Receive[/li][/ul]