Why did Facebook randomly put my friend Sage's picture next to this bright blue top-of-my-feed you-have-memories-of-cats-to-look-back-on-today cat-photo-compilation-that-you-just-KNOW-will-be-all-about-Bitch-Kitty alert?

More importantly, why is Facebook sending me a bright blue top-of-my-feed you-have-memories-of-cats-to-look-back-on-today cat-photo-compilation-that-you-just-KNOW-will-be-all-about-Bitch-Kitty alert?