It sounds like the start of a 21st-century horror film: Your browser history has been public all along, and you had no idea. That’s basically what it feels like right now on the new stand-alone Meta AI app, where swathes of people are publishing their ostensibly private conversations with the chatbot. When you ask the AI a question, you have the option of hitting a share button, which then directs you to a screen showing a preview of the post, which you can then publish. But some users appear bl...