When Fizz quietly debuted in Saudi Arabia in the middle of March, founder and CEO Teddy Solomon wasn’t expecting the app to catch on like it did. Within 48 hours, the app hit No. 1 overall on the App Store charts, and users in the country have since sent more than 1 million messages. For an anonymous social app that started on college campuses, it was a surprising debut. Solomon and his co-founder, Ashton Cofer, started Fizz in 2022 while they were students at Stanford, before dropping out. After raising $40 million and launching on 700 campuses, the app has been pushing beyond its college roots with Fizz Feed, a feature that opens the platform to non-students through location-based communities. Think of it as similar to Reddit, but without the ability to create or join topic-specific communities. Saudi Arabia — where Fizz currently holds the No. 1 spot in the news category — is its first overseas test of that ambition.…