Meta CEO Mark Zuckerberg makes a keynote speech at the Meta Connect annual event at the company's headquarters in Menlo Park, Calif., on Sept. 25, 2024.Manuel Orbegozo | ReutersMeta is debuting its first major artificial intelligence model since the costly hiring of Scale AI's Alexandr Wang nine months ago, as the Facebook parent aims to carve out a niche in a market that's being dominated by OpenAI, Anthropic and Google. Dubbed Muse Spark and originally codenamed Avocado, the AI model announced...