Joe Gebbia, cofounder of Airbnb and the US Chief Design Officer appointed by Trump, was spotted in San Francisco today using a mysterious metallic device. In a social media post on X viewed over 500,000 times, a man who looks like Gebbia sits with an espresso at a coffee shop. He’s wearing metallic buds that bisect his ears, with a matching clamshell-shaped disc in front of him on the counter.After the video was posted Monday morning, social media users were quick to suggest that this could be some kind of prototype from OpenAI’s upcoming line of hardware devices designed in…