By Mika Horelli, BRUSSELS I habitually send birthday greetings to my Facebook friends whenever the platform reminds me to do so. Often, the recipient is someone I know in real life—a friend, relative, colleague, or old schoolmate. Sometimes, the message goes to someone I've never met face-to-face but with whom I've had meaningful exchanges in Facebook comment sections over the years. Last week, however, I received a message from a stranger informing me that one of my Facebook friends, to whom I had just sent birthday wishes, had passed away three years ago. I don't know why their account was still active or who maintained it—if anyone did. Perhaps the profile continued to exist autonomously, powered by algorithms and untouched by human intervention. This wasn't the first time. I've previously sent heartfelt birthday wishes to people no longer alive. These moments make me reflect on what happens when social media platforms construct a parallel reality around us—w...