Startup Idea: Secure Public Wifi for Mobile Devices Startup Idea

Startup idea to develop an app that ensures secure and safe use of public wifi on mobile devices, especially focused on protecting personal data like photographs and social media accounts.

I had my Facebook hacked last October because I logged in using public wifi while on break at work. I lost years of photographs and memories. I would like an app or something similar to protect my phone usage while using public wifi. I tried finding a solution using Google, but nothing was simple enough for me. I have gone to just using my phone data while in public, but it can get very expensive.