What Facebook (and adtech writ large) does is sniff your farts trying to figure out what you had for breakfast. If you shoo them away, they sniff your friends'

What Facebook (and adtech writ large) does is sniff your farts trying to figure out what you had for breakfast. If you shoo them away, they sniff your friends' farts to indirectly infer that. I'm sure the folks who work on this are proud of their accomplishments.