Welcome to Morning Brief presented by Robin Hood, the home to commission free trading. I'm Yahoo Finance executive editor Brian Sazi. Let's fire up three things you need to know today.First up, Meta goes holiday shopping. Mark Zuckerberg's social media beast will acquire AI startup Mattis for $2 billion. Company is a Singapore-based outfit with Chinese founders that conducts deep AI research.It will see Meta enter the AI agent game, putting it potentially on a collision course with Microsoft's co-pilot and ...