Liz Zhang posted that she is hosting the Hack for Humanity San Francisco event with Google Gemini. She described a global effort on Sept 19 in which 130 communities across 52 countries will build AI tools to solve local problems, such as moving restaurant surplus food to people who need it. Zhang framed the projects as one way to answer questions about AI and humanity. Robert Scoble retweeted the announcement without adding new details. The posts present the event as an open invitation for participants to spend a Saturday on a community issue of their choice.