Because he put a big "AI" button on every single one of Meta's apps and surfaces. I'd bet that most of the usage is accidental. Great way to show inflated user counts in your earnings reports and get some directors promoted, sure, but not a long term strategy.
True, that AI button is shoved pretty violently in unexpected places, and surprises me in an unpleasant way, since I've never considered Meta itself as a place to search for information, let alone something trustworthy.
But this is actually interesting. Asking for medical information in the past was the realm of Google Search, now a combo of Google/Gemini/Chatgpt/whatever. Could it be they are going to try to bite off a chunk of that market? kind of like how they chose not to compete with Google search in 2010's. But now are taking another pass at it?