This also happened during the ending of the documentary film Terms and Conditions May Apply. The crew films Zuckerberg outside of his residence and he is notice

This also happened during the ending of the documentary film Terms and Conditions May Apply. The crew films Zuckerberg outside of his residence and he is noticeably indignant at them, being unresponsive to their questions and walking away. He then asks them to turn off the camera, which they do. However, they leave on a hidden spy camera, which shows how after Zuckerberg believes he is no longer being filmed, he turns around, smiles at them and politely gives them permission to pursue further questions at his workplace. This is then used by the filmmaker to illustrate a powerful point. I don't really mean to demonize Zuckerberg, not at all. His reactions are absolutely normal and human, although his public history isn't particularly charming, and it's always interesting to see how a surveillance giant isn't any different in his reception to unwarranted surveillance from the layman.