It was an entertaining experience. We needed to determine India’s regions and study the audiences’ behavior. A budget of 10% of the total for the initial test was set up from the agency account. This was the amount we planned to spend without any result in the form of applications. The test campaigns confirmed our assumptions and provided more information on the audience’s geo, social and behavioral patterns. Also, we cooperated with https://belkins.io/ . As to your second question, Facebook is sufficiently useful, in my experience.