harrymcc writes: As Mark Zuckerberg's personal challenge for 2016, he built Jarvis -- a service similar to Alexa or Google Assistant, but built to do exactly the things he wants to do in his home, and controllable by both voice and Messenger bot. Now that it's mostly complete, he demoed it for Fast Company's Daniel Terdiman. Terdiman writes: "In his January post announcing the Jarvis project, Zuckerberg wrote that he'd set out to build a system allowing him to control everything in the house, including music, lights, and temperature, with his voice. He also wanted Jarvis to let his friends in the house just by looking at their faces when they arrive and to alert him to anything important going on in Max's room. And he hoped to design the system to 'visualize data in VR to help me build better services and lead my organizations [at Facebook] more efficiently.' Now, in December, he has achieved all of that, save for the bit about VR. And it works. However, when he showed off the system to me in person, I learned that it sometimes needs a little coddling. Zuckerberg began by demoing the Messenger bot he'd built as a front end for the system. Using his iPhone, he typed simple commands to turn the lights off and on, and sure enough, they went off and then on. On the other hand, he also built the system to respond to voice commands, via a custom iOS app he'd created, and there, the results were decidedly more inconsistent. He had to tell the system four times to turn the lights off before it got dark."