This was one of the first few articles from Q's bing search link:
"U.S. users are leaving Facebook, new study shows"
https://mashable.com/article/facebook-losing-users-us/
"Facebook is bleeding users by the millions.. [but] Most of those users are switching to Facebook-owned Instagram.
Facebook now has about 15 million users fewer in the U.S. than it had in 2017. A big chunk of the 12-34-year-old demographic has moved to Instagram, with 66 percent of them using the photo-focused social network, as opposed to 62 percent last year."