Meta is notifying thousands of people whose Instagram accounts were hijacked during the months-long abuse of the company's AI chatbot, which hackers repeatedly tricked into taking control of a person's account. In a new data breach notification letter , seen by this week in security , Meta has revealed for the first time how many people had their accounts hijacked as part of the long-running hacking campaign, which was discovered earlier this week and first reported by 404 Media ($) and TechCrunch ($) . The number of affected accounts gives some clarity as to how widespread this hacking campaign was, and for how long it operated.…