I built a Chrome extension that found thousands of Venmo users PUBLICLY revealing their failed dates, late night food runs, losing poker streaks, and more. After a few uses of Venmo, I noticed that the app was giving me the option to share transactions (minus the amount) publicly on my Venmo newsfeed.
The idea of building an app is attractive for many reasons. First, it's tangible. You can build it and put your name on it. Second, it's completely customizable. The canvas is only limited to your imagination and your coding skill. Third, you can track it, monitoring downloads and usage. And of course, you stand to gain money and fame if your app is successful with the masses.