You probably don't know who Alexandr Wang is. But that's going to change: The 28-year-old is about to become known as the guy Mark Zuckerberg spent $15 billion on. Wang is the CEO of Scale AI, a data company that works with giant AI leaders like Meta and OpenAI. And Meta is reportedly about to spend$15 billion to buy a 49% stake in Scale AI.What does Meta get for that investment — which values Scale AI at close to $30 billion, about double its last valuation from a year ago? In theory, that money lets Me ...