Twitter breach caused by employees who fell for social engineering scheme

That big Twitter breach earlier this week was caused by employees who fell for a social engineering scheme. Apple’s Twitter account was breached by Bitcoin scammers who also hacked the Twitter accounts of Elon Musk, Jeff Bezos, and Bill Gates, among others.
Apple’s Twitter account was breached by bitcoin scammers
Twitter’s official blog:At this time, we believe attackers targeted certain Twitter employees through a social engineering scheme. What does this mean? In this context