The Download: Meta's new AI system, and covert Chinese social media activity

The news: Meta is going all in on open-source AI. The company has unveiled LLaMA 2, its first large language model that's available for anyone to use--for free. It's also releasing a version of the AI model that people can build into ChatGPT-style chatbots. Why it matters: The idea is that by releasing the model into the wild and letting developers and companies tinker with it, Meta will learn important lessons about how to make its models safer, less biased, and more efficient. But… Many caveats still remain.