A term for when your caught cheating on someone. All thanks to a facebook post by the person you cheated with. Usually its a combination of an image(s) posted and facial recognition that does it. Sometimes its plain stupidity, a post from your date.
Carl felt very scared when he looked at the top of the stairwell of his apartment building. His girlfriend stood at the top there with her cell and a facebook page open. He realized he had been finked by facebook
When there's a Karen (or a facebook mom) who is being really annoying on a different social media platform (e.g. twitter), and should just go back to Facebook. It's used when people are really annoying. It's basically a way of saying "Go back to where you came from", but more respectfully, and less racist.