Scale AI co-founder Alexandr Wang is such an enthusiastic networker that his former roommate — OpenAI Chief Executive Officer Sam Altman — once jokingly told him to tone it down a bit.Fortunately for Wang,

Wang will remain involved with Scale AI as a board member and is expected to bring several employees with him to Meta. He has led the company since co-founding it in 2016 to supply high-quality labeled data—sourced through human contractors—for training A.I. systems.

Here’s what you need to know about the deal, what its implications may be, and why Wang is of such interest to Zuckerberg’s sprawling digital content company. Wang dropped out of MIT in his freshman year to co-found Scale with social media influencer and engineer Lucy Guo.