Nearly 11 years ago, Facebook took a giant step toward becoming the global social networking behemoth that it is today. It launched “Facebook Platform,” opening itself up and inviting outside software developers to create their own inventive applications running on top of the company’s trove of user data, and letting them earn ad revenue on those apps to boot. Soon, a whole ecosystem of services and games grew up inside and around the site. For tech industry insiders, it was the moment when Facebook really started to grow up and demonstrate its potential.At the time, at techPresident, our old group blog and news site, we noticed something unusual. Among the many commercial apps showcased by Mark Zuckerberg at Platform’s launch, there...