Scale AI, an artificial intelligence start-up, has built a business by labeling and culling data to make it easier to use to train A.I. systems.

The investment by Meta for a 49 percent stake in Scale AI comes as the company is also developing what it calls “superintelligence.”

After dropping out of MIT, Wang founded Scale at the age of 19. Last year, the company was valued at nearly $14 billion. Meta, which owns and operates Facebook and Instagram—as well as Threads, Messenger,