Facebook doesn’t have the best track record when it comes to keeping user data private. So when it revealed a few weeks ago that it was working on a prototype wearable computer that would interpret neuroelectrical signals, people had questions. The wearable—still very much just a concept—is designed to be worn on the wrist, where it could read a wearer’s nerve signals through their skin and translate them into device commands. It’s an idea straight out of sci-fi, and one that could actually be useful in VR and AR applications. But why is Facebook, with its massive software portfolio, working on hardware like this in earnest? How much more “connected” should we all be to Facebook apps? And should we trust the company to handle our data responsibly?