How is the right to privacy being violated though?

Imagine you were a stripper or porn actress, your right to privacy wouldn't preclude someone recognizing you at the strip club or video.

Or suppose you went to the strip club or watched a video and then also happened to be on Facebook and saw the profile of someone you saw stripping at a strip club or in the video, matching the face and name in your head.

How is the slow case different fundamentally from the case where programming is used and throughput and speed is much higher and faster?

I mean would it be illegal for someone to just start going through Facebook profiles by hand trying to find an actress they just saw?